Neck Muscles

Question 1

Sternocleidomastoid Muscle (SCM):

Answer 1

Long, superficial muscles on EACH side of neck

separates neck into 2 regions anterior/posterior triangles

Action: rotates head, flexion of neck
-Acessory nerve

Question 2

Intercostal Spaces:

Answer 2

Spaces b/w ribs contain 3 layers of intercostal muscles

• expand/compress chest for respiration/breathing
• intercostal nerve

Question 3

External Intercostal Muscles:

Answer 3

Elevate the ribs for breathing

• intercostal nerve
• originate on superior rib & insert on inferior rib

Question 4

Internal Intercostal Muscles:

Answer 4

Depress the ribs for breathing

• intercostal nerve
• originate on inferior rib & insert on superior rib

Question 5

Thoratic Wall:

Answer 5

3 layers
1- external
2-internal
3-3 subgroups

Question 6

the 3 subgroups of the thoratic wall:

Answer 6

Transversus muscles (anterior)
Innermost intercostal muscles (lateral)
Subcostal muscles (posterior)

to assist the internal intercostal muscles w/ depressing the ribs