Triangles of Neck in Human Anatomy MCQ Questions and Answers

1. Which muscle forms the posterior boundary of the submandibular triangle?
A) Digastric (anterior belly)
B) Stylohyoid
C) Sternocleidomastoid
D) Mylohyoid
Answer: B) Stylohyoid

2. The inferior belly of omohyoid divides which triangle?
A) Muscular triangle
B) Carotid triangle
C) Submental triangle
D) Posterior triangle
Answer: B) Carotid triangle

3. The roof of the posterior triangle is formed by which fascia?
A) Investing layer of deep cervical fascia
B) Platysma and skin
C) Pretracheal fascia
D) Prevertebral fascia
Answer: B) Platysma and skin

4. Which structure forms the base of the posterior triangle?
A) Trapezius
B) Clavicle
C) Middle one-third of clavicle
D) Sternocleidomastoid
Answer: C) Middle one-third of clavicle

5. Which of the following triangles lies below the hyoid bone?
A) Submental
B) Muscular triangle
C) Carotid triangle
D) Submandibular triangle
Answer: B) Muscular triangle

6. Which important nerve crosses the posterior triangle superficially?
A) Hypoglossal nerve
B) Spinal accessory nerve
C) Vagus nerve
D) Phrenic nerve
Answer: B) Spinal accessory nerve

7. Which of the following arteries is found in the carotid triangle?
A) Vertebral artery
B) Common carotid artery
C) Thyrocervical trunk
D) Dorsal scapular artery
Answer: B) Common carotid artery

8. The submental triangle contains which of the following?
A) Facial artery
B) Hypoglossal nerve
C) Submental lymph nodes
D) Superior thyroid artery
Answer: C) Submental lymph nodes

9. The muscular triangle is bounded laterally by which muscle?
A) Omohyoid (superior belly)
B) Sternocleidomastoid
C) Digastric (posterior belly)
D) Trapezius
Answer: B) Sternocleidomastoid

10. Which structure passes through both anterior and posterior triangles?
A) Vagus nerve
B) External jugular vein
C) Internal jugular vein
D) Hypoglossal nerve
Answer: B) External jugular vein

11. The floor of the posterior triangle is formed by which fascia?
A) Investing layer
B) Prevertebral fascia
C) Carotid sheath
D) Buccopharyngeal fascia
Answer: B) Prevertebral fascia

12. The superior boundary of the posterior triangle is formed by:
A) Sternocleidomastoid
B) Clavicle
C) Occipital bone (superior nuchal line)
D) Trapezius
Answer: C) Occipital bone (superior nuchal line)

13. Which triangle contains the ansa cervicalis?
A) Submental triangle
B) Carotid triangle
C) Muscular triangle
D) Posterior triangle
Answer: B) Carotid triangle

14. Which of the following triangles is unpaired?
A) Carotid triangle
B) Submandibular triangle
C) Submental triangle
D) Muscular triangle
Answer: C) Submental triangle

15. Which muscle divides the neck into anterior and posterior triangles?
A) Sternocleidomastoid
B) Omohyoid
C) Digastric
D) Trapezius
Answer: A) Sternocleidomastoid

16. The accessory nerve supplies which muscle in the posterior triangle?
A) Levator scapulae
B) Trapezius
C) Scalenus anterior
D) Omohyoid
Answer: B) Trapezius

17. Which vein runs across the sternocleidomastoid in the superficial fascia?
A) Internal jugular vein
B) External jugular vein
C) Anterior jugular vein
D) Retromandibular vein
Answer: B) External jugular vein

18. The contents of the muscular triangle include which gland?
A) Parotid
B) Submandibular
C) Thyroid
D) Lacrimal
Answer: C) Thyroid

19. The posterior belly of digastric forms which boundary?
A) Carotid triangle (superior boundary)
B) Muscular triangle (lateral boundary)
C) Submental triangle (medial boundary)
D) None of the above
Answer: A) Carotid triangle (superior boundary)

20. Which triangle contains the hypoglossal nerve?
A) Submental triangle
B) Submandibular triangle
C) Muscular triangle
D) Posterior triangle
Answer: B) Submandibular triangle

21. The inferior root of ansa cervicalis arises from which nerve?
A) C2–C3 cervical nerves
B) C1 via hypoglossal
C) C4 spinal nerve
D) Vagus
Answer: A) C2–C3 cervical nerves

22. The nerve to mylohyoid is a branch of which nerve?
A) Facial nerve
B) Inferior alveolar nerve
C) Lingual nerve
D) Hypoglossal nerve
Answer: B) Inferior alveolar nerve

23. The apex of the posterior triangle is directed towards:
A) Mastoid process
B) Sternum
C) Hyoid bone
D) Mandible
Answer: A) Mastoid process

24. The submandibular gland lies in which triangle?
A) Carotid triangle
B) Submental triangle
C) Submandibular triangle
D) Muscular triangle
Answer: C) Submandibular triangle

25. The floor of the carotid triangle is formed mainly by:
A) Thyrohyoid
B) Middle and inferior constrictors of pharynx
C) Mylohyoid
D) Sternohyoid
Answer: B) Middle and inferior constrictors of pharynx

26. Which muscle forms the posterior boundary of the posterior triangle?
A) Sternocleidomastoid
B) Trapezius
C) Omohyoid
D) Scalenus medius
Answer: B) Trapezius

27. The carotid sheath does NOT contain which of the following?
A) Common carotid artery
B) Internal jugular vein
C) External carotid artery
D) Vagus nerve
Answer: C) External carotid artery

28. The anterior triangle of the neck is bounded posteriorly by which structure?
A) Clavicle
B) Anterior border of sternocleidomastoid
C) Midline of neck
D) Mandible
Answer: B) Anterior border of sternocleidomastoid

29. The floor of the posterior triangle includes which muscle?
A) Scalenus medius
B) Mylohyoid
C) Platysma
D) Digastric
Answer: A) Scalenus medius

30. The occipital triangle is a subdivision of:
A) Posterior triangle
B) Anterior triangle
C) Submandibular triangle
D) Carotid triangle
Answer: A) Posterior triangle

31. The inferior belly of omohyoid divides the posterior triangle into:
A) Submandibular and submental triangles
B) Occipital and supraclavicular triangles
C) Carotid and muscular triangles
D) Subclavian and carotid triangles
Answer: B) Occipital and supraclavicular triangles

32. Which of the following triangles contains the cervical plexus?
A) Submandibular
B) Carotid
C) Posterior triangle
D) Muscular
Answer: C) Posterior triangle

33. The apex of the anterior triangle is directed towards:
A) Mandible
B) Manubrium sterni
C) Mastoid process
D) Clavicle
Answer: B) Manubrium sterni

34. The contents of the submandibular triangle include:
A) Hypoglossal nerve
B) Facial artery and vein
C) Submandibular gland
D) All of the above
Answer: D) All of the above

35. The subclavian artery is found in which triangle?
A) Submandibular triangle
B) Carotid triangle
C) Supraclavicular triangle
D) Muscular triangle
Answer: C) Supraclavicular triangle

36. The internal jugular vein lies lateral to which artery in the carotid triangle?
A) External carotid artery
B) Common carotid artery
C) Superior thyroid artery
D) Lingual artery
Answer: B) Common carotid artery

37. Which nerve is found deep to the investing fascia in the posterior triangle?
A) Spinal accessory nerve
B) Hypoglossal nerve
C) Vagus nerve
D) Glossopharyngeal nerve
Answer: A) Spinal accessory nerve

38. The roof of the anterior triangle is formed by:
A) Investing layer of deep fascia
B) Skin and platysma
C) Superficial fascia
D) All of the above
Answer: D) All of the above

39. The muscular triangle contains which major viscera?
A) Larynx
B) Trachea
C) Thyroid gland
D) All of the above
Answer: D) All of the above

40. The carotid body is located at the level of:
A) C5 vertebra
B) Upper border of thyroid cartilage
C) Cricoid cartilage
D) Jugular foramen
Answer: B) Upper border of thyroid cartilage

41. The external carotid artery gives rise to how many branches before it enters the parotid gland?
A) Eight
B) Six
C) Four
D) Ten
Answer: A) Eight

42. The internal jugular vein begins as a continuation of:
A) Sigmoid sinus
B) Transverse sinus
C) Cavernous sinus
D) Superior sagittal sinus
Answer: A) Sigmoid sinus

43. The nerve that crosses both the carotid and muscular triangles is:
A) Ansa cervicalis
B) Hypoglossal nerve
C) Vagus nerve
D) Glossopharyngeal nerve
Answer: A) Ansa cervicalis

44. The supraclavicular triangle is bounded inferiorly by:
A) Clavicle
B) Sternocleidomastoid
C) Trapezius
D) Omohyoid
Answer: A) Clavicle

45. The occipital artery is a branch of which artery?
A) Internal carotid artery
B) External carotid artery
C) Vertebral artery
D) Thyrocervical trunk
Answer: B) External carotid artery

46. Which muscle forms the lateral boundary of the muscular triangle?
A) Superior belly of omohyoid
B) Mylohyoid
C) Digastric
D) Trapezius
Answer: A) Superior belly of omohyoid

47. The anterior jugular vein drains into:
A) Internal jugular vein
B) External jugular vein
C) Subclavian vein
D) Brachiocephalic vein
Answer: B) External jugular vein

48. Which triangle of the neck is most commonly involved in thyroid surgery?
A) Submandibular triangle
B) Carotid triangle
C) Muscular triangle
D) Submental triangle
Answer: C) Muscular triangle

49. The floor of the submandibular triangle is formed by:
A) Mylohyoid and hyoglossus
B) Platysma
C) Sternohyoid
D) Omohyoid
Answer: A) Mylohyoid and hyoglossus

50. The posterior triangle contains which part of the brachial plexus?
A) Divisions
B) Trunks
C) Cords
D) Terminal branches
Answer: B) Trunks

51. Which of the following structures is found within the carotid sheath?
A) Vagus nerve
B) Hypoglossal nerve
C) Sympathetic trunk
D) Ansa cervicalis
Answer: A) Vagus nerve

52. The ansa cervicalis lies on which structure?
A) Internal jugular vein
B) Carotid sheath
C) Pretracheal fascia
D) Thyroid gland
Answer: B) Carotid sheath

53. Which structure crosses the occipital triangle superficially?
A) External jugular vein
B) Spinal accessory nerve
C) Transverse cervical artery
D) Great auricular nerve
Answer: A) External jugular vein

54. The submandibular triangle is also known as:
A) Digastric triangle
B) Muscular triangle
C) Laryngeal triangle
D) Carotid triangle
Answer: A) Digastric triangle

55. The muscular triangle contains which infrahyoid muscles?
A) Sternohyoid and sternothyroid
B) Omohyoid and thyrohyoid
C) All of the above
D) None of the above
Answer: C) All of the above

56. Which artery lies deep to the posterior belly of digastric muscle?
A) Lingual artery
B) Occipital artery
C) Facial artery
D) Superior thyroid artery
Answer: B) Occipital artery

57. Which triangle contains the carotid sinus?
A) Muscular triangle
B) Carotid triangle
C) Submandibular triangle
D) Posterior triangle
Answer: B) Carotid triangle

58. The carotid sinus is mainly supplied by which nerve?
A) Hypoglossal nerve
B) Glossopharyngeal nerve
C) Vagus nerve
D) Facial nerve
Answer: B) Glossopharyngeal nerve

59. The inferior root of ansa cervicalis descends along which vessel?
A) Internal carotid artery
B) Internal jugular vein
C) External jugular vein
D) Common carotid artery
Answer: B) Internal jugular vein

60. The digastric muscle has two bellies connected by:
A) Common tendon
B) Intermediate tendon
C) Muscular raphe
D) Fibrous sheath
Answer: B) Intermediate tendon

61. The subclavian vein is located in which part of the posterior triangle?
A) Lower part (supraclavicular triangle)
B) Upper part
C) Medial part
D) Anterior part
Answer: A) Lower part (supraclavicular triangle)

62. Which of the following nerves emerges from the posterior border of sternocleidomastoid?
A) Lesser occipital nerve
B) Phrenic nerve
C) Hypoglossal nerve
D) Ansa cervicalis
Answer: A) Lesser occipital nerve

63. The nerve to thyrohyoid arises from:
A) C2–C3 cervical nerves
B) C1 fibers via hypoglossal nerve
C) Ansa cervicalis
D) Superior cervical ganglion
Answer: B) C1 fibers via hypoglossal nerve

64. The carotid bifurcation occurs at which vertebral level?
A) C2
B) C3
C) C4
D) C5
Answer: C) C4

65. Which triangle contains the upper part of the external carotid artery?
A) Carotid triangle
B) Submandibular triangle
C) Muscular triangle
D) Posterior triangle
Answer: A) Carotid triangle

66. The occipital triangle’s floor is mainly formed by which muscle?
A) Levator scapulae
B) Splenius capitis
C) Both A and B
D) Scalenus anterior
Answer: C) Both A and B

67. Which nerve lies within the submandibular triangle?
A) Hypoglossal nerve
B) Glossopharyngeal nerve
C) Spinal accessory nerve
D) Phrenic nerve
Answer: A) Hypoglossal nerve

68. The supraclavicular triangle is also known as:
A) Subclavian triangle
B) Omoclavicular triangle
C) Lateral cervical triangle
D) Occipital triangle
Answer: B) Omoclavicular triangle

69. Which structure separates the anterior and posterior triangles?
A) Clavicle
B) Omohyoid
C) Sternocleidomastoid
D) Trapezius
Answer: C) Sternocleidomastoid

70. Which triangle contains the common facial vein?
A) Submental triangle
B) Carotid triangle
C) Posterior triangle
D) Muscular triangle
Answer: B) Carotid triangle

71. The investing layer of deep cervical fascia splits to enclose:
A) Sternocleidomastoid and trapezius
B) Omohyoid and digastric
C) Sternohyoid and sternothyroid
D) Mylohyoid and hyoglossus
Answer: A) Sternocleidomastoid and trapezius

72. Which muscle forms the inferior boundary of the submental triangle?
A) Sternohyoid
B) Body of hyoid bone
C) Mylohyoid
D) Omohyoid
Answer: B) Body of hyoid bone

73. The roof of the carotid triangle is formed by:
A) Investing layer of deep fascia
B) Pretracheal fascia
C) Prevertebral fascia
D) Buccopharyngeal fascia
Answer: A) Investing layer of deep fascia

74. The hypoglossal nerve crosses which arteries in the carotid triangle?
A) Superior thyroid and lingual
B) Occipital and external carotid
C) Common carotid and internal carotid
D) Facial and maxillary
Answer: B) Occipital and external carotid

75. The apex of the posterior triangle corresponds to which bony landmark?
A) Mastoid process
B) Clavicle
C) Mandibular angle
D) Hyoid bone
Answer: A) Mastoid process

76. Which nerve supplies the skin over the posterior triangle of the neck?
A) Lesser occipital nerve
B) Great auricular nerve
C) Transverse cervical nerve
D) Supraclavicular nerve
Answer: A) Lesser occipital nerve

77. The submental triangle is bounded laterally by which muscle?
A) Sternohyoid
B) Anterior belly of digastric
C) Mylohyoid
D) Omohyoid
Answer: B) Anterior belly of digastric

78. Which of the following arteries lies within the muscular triangle?
A) Facial artery
B) Superior thyroid artery
C) Lingual artery
D) Ascending pharyngeal artery
Answer: B) Superior thyroid artery

79. The posterior triangle is covered superficially by which fascia?
A) Investing layer of deep cervical fascia
B) Pretracheal fascia
C) Carotid sheath
D) Prevertebral fascia
Answer: A) Investing layer of deep cervical fascia

80. Which nerve passes deep to the posterior belly of digastric?
A) Hypoglossal nerve
B) Glossopharyngeal nerve
C) Facial nerve
D) Spinal accessory nerve
Answer: A) Hypoglossal nerve

81. The omohyoid muscle acts as a landmark for identifying which triangle?
A) Posterior triangle (subdivision)
B) Muscular triangle
C) Submandibular triangle
D) Submental triangle
Answer: A) Posterior triangle (subdivision)

82. The carotid sheath extends from:
A) Skull base to mandible
B) Mandible to clavicle
C) Base of skull to root of neck
D) Hyoid bone to thyroid cartilage
Answer: C) Base of skull to root of neck

83. The common carotid artery is palpable in which triangle?
A) Submandibular triangle
B) Carotid triangle
C) Muscular triangle
D) Supraclavicular triangle
Answer: B) Carotid triangle

84. Which structure forms the medial boundary of the posterior triangle?
A) Posterior border of sternocleidomastoid
B) Trapezius
C) Omohyoid
D) Scalenus medius
Answer: A) Posterior border of sternocleidomastoid

85. The thyroid cartilage is a surface landmark for which triangle?
A) Submandibular
B) Carotid
C) Submental
D) Posterior
Answer: B) Carotid

86. The investing layer of cervical fascia splits at the lower border of mandible to enclose which gland?
A) Parotid
B) Submandibular gland
C) Thyroid gland
D) Sublingual gland
Answer: B) Submandibular gland

87. The cervical plexus gives rise to which of the following cutaneous branches?
A) Lesser occipital nerve
B) Great auricular nerve
C) Transverse cervical nerve
D) All of the above
Answer: D) All of the above

88. The anterior triangle of neck is further divided by which muscle?
A) Digastric and omohyoid muscles
B) Sternocleidomastoid
C) Platysma
D) Mylohyoid
Answer: A) Digastric and omohyoid muscles

89. Which nerve emerges between the anterior and middle scalene muscles in the posterior triangle?
A) Brachial plexus roots
B) Spinal accessory nerve
C) Phrenic nerve
D) Vagus nerve
Answer: A) Brachial plexus roots

90. The floor of the submental triangle is formed by:
A) Mylohyoid muscle
B) Sternohyoid
C) Omohyoid
D) Geniohyoid
Answer: A) Mylohyoid muscle

91. The internal jugular vein joins which vein to form the brachiocephalic vein?
A) Subclavian vein
B) External jugular vein
C) Facial vein
D) Inferior thyroid vein
Answer: A) Subclavian vein

92. Which artery passes deep to the hyoglossus muscle?
A) Lingual artery
B) Facial artery
C) Superior thyroid artery
D) Ascending pharyngeal artery
Answer: A) Lingual artery

93. The ansa cervicalis innervates all infrahyoid muscles except:
A) Sternohyoid
B) Sternothyroid
C) Omohyoid
D) Thyrohyoid
Answer: D) Thyrohyoid

94. The posterior triangle contains which vein as a major superficial structure?
A) External jugular vein
B) Internal jugular vein
C) Facial vein
D) Retromandibular vein
Answer: A) External jugular vein

95. The anterior triangle’s apex is located at:
A) Mandible
B) Mastoid process
C) Jugular notch of manubrium
D) Clavicle
Answer: C) Jugular notch of manubrium

96. The submandibular duct opens into which structure?
A) Oral vestibule
B) Sublingual papilla
C) Palatine tonsil
D) Tongue base
Answer: B) Sublingual papilla

97. The nerve crossing the occipital triangle horizontally is:
A) Phrenic nerve
B) Spinal accessory nerve
C) Hypoglossal nerve
D) Ansa cervicalis
Answer: B) Spinal accessory nerve

98. The supraclavicular triangle contains which part of the subclavian artery?
A) First part
B) Third part
C) Second part
D) None
Answer: B) Third part

99. The apex of the submandibular triangle points toward:
A) Anterior belly of digastric
B) Hyoid bone
C) Mandibular angle
D) Midline of neck
Answer: A) Anterior belly of digastric

100. The cervical lymph nodes lying along the internal jugular vein are called:
A) Submental nodes
B) Deep cervical lymph nodes
C) Superficial cervical nodes
D) Submandibular nodes
Answer: B) Deep cervical lymph nodes