Triangles Of The Neck Lecture 1

Front 1

When the SCM contracts bilaterally, what happens?

Back 1

1) Draws head forward
2) Draws chin upward

Front 2

What does unilateral contraction of the SCM do?

Back 2

1) Rotates face to the contralateral side.

2) Unilaterally draws the head

Front 3

The SCM receives innervation from the _____ nerves and proprioceptive fibers from the anterior ramus of ____.

Back 3

1) Accessory Nerve XI
2) C2

Front 4

What are the boundaries of the posterior triangle?

Back 4

1) Posterior SCM
2) Anterior Trapezius
3) 1/3 medial clavicle

Front 5

The roof of the posterior triangle ____.

Back 5

Investing layer of deep cervical fascia.

Front 6

The floor of the posterior triangle ____.

Back 6

Prevertebral facia and subjacent muscles

Front 7

What are the muscles of the floor of the posterior triangle?

Back 7

1) Splenius Capitis
2) Levator Scapulae
3) Posterior scalene
4) Middle scalene
5) Anterior scalene

Front 8

What is deep to the superficial facia and overlays the SCM and posterior triangle?

Back 8

1) External jugular vein
2) Cutaneous branches of the cervical plexus

Front 9

What is clinically important about the external jugular vein?

Back 9

1) It pierces the deep cervical facia to meet the subclavian vein.
2) Descends across the SCM
3) If it is cut by a stab wound, an air embolism can obstruct blood flow to the heart.

Front 10

What are the cutaneous nerves of the posterior triangle and where do they arise from?

Back 10

1) They arise from the middle of the posterior border of the SCM

-Lesser occipital (C2-C3)
-Great auricular (C2-C3)
-Transverse Cervical (C2-C3)
-Supraclavicular (C3-C4)

Front 11

What is thoracic outlet syndrome?

Back 11

The inferior trunk of the brachial plexus or subclavian artery can be compressed by an enlargened C7 cervical rib.