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Anatomy > Posterior Triangle of the Neck > Flashcards

Posterior Triangle of the Neck Flashcards

1
Q

What is the origin of the Sternocleidomastoid muscle?

A

Sternum and clavicle (one head from each)

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2
Q

What is the insertion of the Sternocleidomastoid muscle?

A

mastoid process

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3
Q

What nerve supplies the Sternocleidomastoid muscle?

A

CN XI

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4
Q

What artery supplies the Sternocleidomastoid muscle?

A

sternocleidomastoid branch of the occipital artery

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5
Q

What is the action of the Sternocleidomastoid muscle?

A

unilaterally contracts head to the same said, bilaterally extends neck at atlanto-occipital joint, flexes cervical vertebrae, or thrusts chin forward while head is kept level

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6
Q

What noteworthy structure lies deep to the Sternocleidomastoid muscle?

A

The carotid sheath

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7
Q

What is the origin of the Platysma muscle?

A

subcutaneous fascia over pectoral region of chest wall (pec major and deltoid)

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8
Q

What is the insertion of the Platysma muscle?

A

inferior border of the mandible and skin of lower face

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9
Q

What nerve supplies the Platysma muscle?

A

cervical branch of CN VII

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10
Q

What artery supplies the Platysma muscle?

A

facial artery

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11
Q

What is the action of the Platysma muscle?

A

muscle of facial expression, draws corners of mouth down and aids in depression of mandible

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12
Q

What is noteworthy about the Platysma muscle?

A

derived from mesenchyme of second pharyngeal arch

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13
Q

What is the origin of the Posterior Scalene muscle?

A

TP (transverse process) C4-C6

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14
Q

What is the insertion of the Posterior Scalene muscle?

A

2nd rib

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15
Q

What is the nerve supply of the Posterior Scalene muscle?

A

anterior rami of C7-C8

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16
Q

What artery supplies the Posterior Scalene muscle?

A

ascending cervical artery

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17
Q

What is the action of the Posterior Scalene muscle?

A

elevates second rib, flexes and laterally bends the neck

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18
Q

what is noteworthy about the Posterior Scalene muscle?

A

muscle of respiration; longest of scalene muscles

19
Q

What is the origin of the Middle Scalene muscle?

A

TP C4-C6

20
Q

What is the insertion of the Middle Scalene muscle?

A

1st rib

21
Q

What is the nerve supply of the Middle Scalene muscle?

A

ventral rami of C3-C8

22
Q

What is the blood supply of the Middle Scalene muscle?

A

ascending cervical artery

23
Q

What is the action of the Middle Scalene muscle?

A

elevates first rib, flexes and laterally bends neck

24
Q

What is noteworthy about the Middle Scalene muscle?

A

muscle of respiration, penetrated by the dorsal scapular nerve and long thoracic nerve

25
Q

What is the origin of the Anterior Scalene muscle?

A

TP C4-C6

26
Q

What is the insertion of the Anterior Scalene muscle?

A

1st rib

27
Q

What is the nerve supply of the Anterior Scalene muscle?

A

ventral rami C4-C6

28
Q

What is the blood supply of the Anterior Scalene muscle?

A

ascending cervical artery

29
Q

What is the action of the Anterior Scalene muscle?

A

elevates first rib, flexes and laterally bends the neck

30
Q

What is noteworthy about the Anterior Scalene muscle?

A

muscle of respiration, located between subclavian vein and subclavian artery. Root of brachial plexus pass posterior to it. Phrenic nerve crosses anterior surface.

31
Q

What is the origin of the Splenius Capitus muscle?

A

ligamenum nichae and SP C7-T3

32
Q

What is the insertion of the Splenius Capitus muscle?

A

occipital bone and mastoid process

33
Q

What is the nerve supply of the Splenius Capitus muscle?

A

Dorsal primary rami of C2-C6

34
Q

What is the blood supply of the Splenius Capitus muscle?

A

deep cervical artery

35
Q

What is the action of the Splenius Capitus muscle?

A

extends and laterally bends the neck and head, rotates head to same side

36
Q

What is the origin of the Levator Scapulae muscle?

A

TP C2-C4

37
Q

What is the insertion of the Levator Scapulae muscle?

A

superior angle of scapula

38
Q

What is the nerve supply of the Levator Scapulae?

A

dorsal scapular nerve

39
Q

What is the blood supply of the Levator Scapulae?

A

dorsal scapular artery

40
Q

What is the action of the Levator Scapulae?

A

elevates the scapula

41
Q

What are the boundaries of the Posterior Cervical Triangle?

A

Posterior border of SCM, anterior border of trapezius, middle third of clavicle. (It is further divided into the subclavian triangle and the occipital triangle)

42
Q

What are the boundaries of the Subclavian Triangle?

A

inferior belly of omohyoid, SCM and middle third of clavicle. (Contains parts of external jugular vein and the subclavian artery)

43
Q

What cranial nerve crosses the Occipital Triangle?

A

CN XI

44
Q

What are the muscles of the Posterior Triangle of the Neck?

A

Sternocleidomastoid, Platysma, Posterior Scalene, Middle Scalene, Anterior Scalene, Splenius Capitus, and Levator Scapulae

Anatomy (17 decks)

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