Anatomy Lab 3

Question 1

What features of the clavicle allow you to distinguish

a) Medial from lateral
b) Anterior from posterior
c) Superior from inferior

Answer 1

Question 2

What is the role of the clavicle in the mechanics of the shoulder?

Answer 2

It is a strut that holds the shoulder laterally.
This provides a firm base for the limb to be positioned
in 3D space, for grasping and manipulating

Question 3

identify the muscles that attach to the clavicle, and in each case indicate the nerve supply

Answer 3

Question 4

What bony feature does the anterior scalene muscle arise from?
What about the posterior scalene muscle?

Answer 4

• Anterior Scalene muscles arise from the anterior tubercles of the cervical transverse processes
• Middle and Posterior Scalene muscles arise from the posterior tubercles of cervical transverse processe

Question 5

What musculature does the accessory nerve supply?

Answer 5

Trapezius
Sternocleidomastoid

Question 6

What does the cervical plexus (C1, 2, 3, 4, 5) supply?
a) Motor
b) Sensory

Answer 6

a) Infrahyoid strap muscles
Diaphragm (partly)
Rhomboids
Levator scapulae (sometimes)
b) Neck and back of head

Question 7

The phrenic nerve comes partly from the cervical plexus and partly from the brachial plexus (C3,4,5).
What does it supply?
a) Motor
b) Sensory

Answer 7

a) Diaphragm
b) Peritoneum
Pleura
Pericardium

Question 8

What passes through this opening in the posterior axillary wall?

Answer 8

“Quadrangular space”
Axillary nerve
Posterior circumflex vessels