Posterior triangle Flashcards

1
Q

Boundaries

A

Anterior border of trapezius
Posterior border of sternocleidomastoid
Middle 1/3 of clavicle
Apex = superior nuchal line

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2
Q

Attachments of sternocleidomastoid

A

medial 1/3 clavicle and manubrium sterni

Mastoid process and superior nuchal line

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3
Q

Innervation of sternocleidomastoid

A

Spinal accessory nerve

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4
Q

What movement occurs when 1 sternocleidomastoid contracts?

A

Lateral movement - mastoid process to shoulder

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5
Q

What movement occurs when both sternocleidomastoid contract?

A

Bilateral flexion of the head and neck

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6
Q

Attachments of trapezius

A

Superior nuchal line and external occipital protuberance.
Vertebral column from C1 to T12
Lateral 1/3 of clavicle

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7
Q

Innervation of trapezius

A

Spinal accessory nerve

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8
Q

Function of trapezius

A

Rotate scapula and raise the arm

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9
Q

What muscles form the floor of the posterior triangle?

A

Splenius capitus, levator scapule, scalenus medius and posterior, scalenus anterior

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10
Q

What n. and a. are found deep in the posterior triangle?

A

Spinal accessory nerve runs through elevator scapule.
Phrenic nerve runs through scalenus anterior.
Brachial plexus and subclavian a. run in-between scalenus medius and anterior.

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11
Q

What cutaneous nerves can be seen on the superficial view of the posterior triangle?

A
Nerves of cervical plexus.
Lesser occipital (C1-C2)
Great auricular (C2-C3)
Transverse cervical (C2-C3)
Supraclavicular (C3-C4)
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12
Q

What muscle can be seen on the superficial view of the posterior triangle?

A

Omohyoid

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13
Q

What vein can be seen on the superficial view of the posterior triangle?

A

External jugular vein

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14
Q

What structures can be seen on the superficial view of the posterior triangle?

A

Cervical plexus - lesser occipital, great auricular, transverse cervical, supraclavicular
External jugular vein
Omohyoid

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15
Q

Where does the spinal accessory nerve enter the skull?

A

Fo. magnum

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16
Q

Where does the spinal accessory nerve leave the skull?

A

Jugular fo.

17
Q

What does CN XI innervate?

A

Trapezius and sternocleidomastoid

18
Q

To which muscle is the cervical plexus deep?

A

Sternocleidomastoid