Anterior Shoulder Flashcards Preview

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Flashcards in Anterior Shoulder Deck (13):
1

Pectoralis Major Attachments.

Orig (2 parts)

and Insert

 

Orig. Clavicular Head:

Anterior surface of medial half of Clavicle.

Sternal Head:

Anterior surface of sternum.

Insert. Lateral lip of intertubercular sulcus of humerus.

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2

Innervation and action of pectoralis major.

Medial and Laterla Pectoral Nerves.

Actions: Flexion, Adduction, and medial rotation

Clavicular head: Flexion of extended arm.

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3

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Pectoralis Minor

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4


Attachments, Innervation and Action of pectoralis minor

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.)

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5


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


Twisting keeps things from crushing us.

6


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


Fibrocartilage disc in the joint.

Hyaline cartilage over bones.

7


Describe the innervation path to both Pectoralis major and minor.

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Lateral Pectoral Nerve goes to P. Major only.

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

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8

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Subclavius Muscle

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9


Attachments

Innervation

Action

of Subclavius Muscle

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.)

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10

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Serratus Anterior

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11

Serratus Anterior

Attachment

Innervation

Action


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.)

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12


Winging scapula causes


Weak serratus anterior

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

13

Pectoralis Minor

A: orig, insert

N: 1

F: 2

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.