Posterior triangle muscles Flashcards

1
Q

Platysma is found in the? (origin and insertion)

A

superficial fascia

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2
Q

sternocleidomastoid (SCM) origin

A

manubrium and medial clavicle

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3
Q

SCM insertion

A

mastoid process and superior nuchal line

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4
Q

SCM innervation

A

CN XI aka Spinal accessory nerve

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5
Q

SCM action

A
  • acting unilaterally = laterally flexes and rotates

* acting bilaterally= posterior fibers act to extend the neck; anterior fibers act to flex the neck

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6
Q

SCM anterior and posterior fibers attach?

A
  • *posterior fibers attach at superior nuchal line and clavicle AND ACT to extend the neck
  • *anterior fibers attach at mastoid process and manubrium AND ACT to flex the neck
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7
Q

SCM stands for?

A

sternocleidomastoid muscle

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8
Q

trapezius origin

A

external occipital protuberance, nuchal ligament, spinous processes down to T12

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9
Q

trapezius insertion

A

lateral 1/3rd of clavicle, acromion, spine of scapula

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10
Q

trapezius innervation

A

CN XI aka Spinal accessory nerve

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11
Q

trapezius action

A

elevate, depress, and retract scapula; rotate scapula superiorly

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12
Q

Semispinalis capitis and Splenius capitis origin

A

upper thoracic and lower cerivical vertebrae

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13
Q

Semispinalis capitis and Splenius capitis insertion

A

occipital bone, between nuchal lines to mastoid process

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14
Q

Semispinalis capitis and Splenius capitis innervation

A

posterior rami of cervical nerves (Dorsal rami because deep neck)

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15
Q

Semispinalis capitis and Splenius capitis action

A
Unilateral = lateral flexion and rotation
bilateral= extension of head
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16
Q

What two muscles are innervated by CN XI aka Spinal accessory nerve?

A

trapezius and sternocleidomastoid (SCM)

17
Q

Levator scapulae origin

A

C1-C4 vertebrae

18
Q

Levator scapulae insertion

A

medial border of scapula

19
Q

Levator scapulae innervation

A

C3-C5 nerves

20
Q

Levator scapulae action

A

Elevate scapula

21
Q

Posterior, Middle and Anterior Scalene origin?

A

C2-C7 vertebrae

22
Q

Posterior, Middle and Anterior Scalene insertion?

A

1st and 2nd ribs

23
Q

Posterior, Middle and Anterior Scalene innervation?

A

C3-C6 nerves

24
Q

Posterior, Middle and Anterior Scalene action?

A
Elevate ribs (inspiration)
*scalene muscles are accessory muscles to the diaphragm because they help to elevate the ribs, which increase the volume in the thoracic cavity
25
Inferior belly of omohyoid origin
superior scapula
26
Inferior belly of omohyoid insertion
hyoid bone via intermediate tendon
27
Inferior belly of omohyoid innervation
ansa cervicalis (part of cervical plexus)
28
Inferior belly of omohyoid action
depresses larynx (phonation and swallowing)
29
What triangle is the superior and inferior belly of omohyoid found?
``` inferior= posterior superior= anterior ```
30
Platysma innervation?
facial nerve
31
Platysma action?
tenses skin of neck