Anterior Shoulder

Question 1

Pectoralis Major Attachments.

Orig (2 parts)

and Insert

Answer 1

Orig. Clavicular Head:

Anterior surface of medial half of Clavicle.

Sternal Head:

Anterior surface of sternum.

Insert. Lateral lip of intertubercular sulcus of humerus.

Question 2

Innervation and action of pectoralis major.

Answer 2

Medial and Laterla Pectoral Nerves.

Actions: Flexion, Adduction, and medial rotation

Clavicular head: Flexion of extended arm.

Question 3

Answer 3

Pectoralis Minor

Question 4

Attachments, Innervation and Action of pectoralis minor

Answer 4

Attachments:
Orig: Anterior surface of superior borders of ribs 3-5

Insert: Corocoid process of scapula

Innervation:
Medial Pectoral nerve/s

Action:
Pulls top of shoulder down.
Protracts Scapula (Pulls scapula forward and pushes arms forward.)

Question 5

What is the purpose of the twisting motion of the pectoralis major?

Answer 5

Twisting keeps things from crushing us.

Question 6

What is the cartilage structure of the joints connecting ribs and vertebra?

Answer 6

Fibrocartilage disc in the joint.

Hyaline cartilage over bones.

Question 7

Describe the innervation path to both Pectoralis major and minor.

Answer 7

Lateral Pectoral Nerve goes to P. Major only.

Medial Pectoral Nerve goes to both P. Major and Minor.

Question 8

Answer 8

Subclavius Muscle

Question 9

Attachments

Innervation

Action

of Subclavius Muscle

Answer 9

1. Attachments–Orig. 1st rib at junction of rib and costal cartilage,

Insert. Groove of inferior surface of Middle 1/3 of clavicle

2. Innervation–Nerve to the subclavius
3. Action–Anchors clavicle (Pulls tip of shoulder down, pulls clavicle medially.)

Question 10

Answer 10

Serratus Anterior

Question 11

Serratus Anterior

Attachment

Innervation

Action

Answer 11

1. Attachment–Ribs, Medial boarder of scapula
2. Innervation–Long Thoracic Nerve (Nerve on the outside of the muscle. ) C5-7 (5, 6, 7, Spread your wings and go to heaven.)
3. Action–Protracts the scapula and holds it againg the thoracic wall. (Runs under scapula to vertebral edge. Holds scapula down.)

Question 12

Winging scapula causes

Answer 12

Weak serratus anterior

Damage to long thoracic nerve. (Also causes innability to raise arms above 90 degrees.)

Question 13

Pectoralis Minor

A: orig, insert

N: 1

F: 2

Answer 13

A: Orig. Anterior surface of superior borders of ribs 3-5

Insert. Corocoid porcess of scapula.

N. Medial Pectoral Nerve.

F: Pulls top of shoulder down.

Protracts scapula.