Muscles of the Upper Extremity: Axiohumeral Muscles Flashcards Preview

Gross Anatomy Muscle Attachments > Muscles of the Upper Extremity: Axiohumeral Muscles > Flashcards

Flashcards in Muscles of the Upper Extremity: Axiohumeral Muscles Deck (8)
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1
Q

Latissimus Dorsi Proximal Attachment

A

Spinous process of T6-12, thoracolumbar fascia, posterior iliac crest, and lower ribs

2
Q

Latissimus Dorsi Distal Attachment

A

Floor of the intertubercular groove of the humerus

3
Q

Latissimus Dorsi Innervation

A

Thoracodorsal n. [C6,C7,C8]

4
Q

Latissimus Dorsi Action

A
Extends the shoulder
Adducts the shoulder
Medially rotates the shoulder
Depresses the shoulder girdle
Assists with:
-Extension of the trunk
-Lateral flexion of the trunk
5
Q

Pectoralis Major Proximal Attachment

A

Clavicular head: medial end of the clavicle

Sternocostal head: anterior sternum and costal cartilages of the first 6 ribs

6
Q

Pectoralis Major Distal Attachment

A

Lateral lip of the intertubercular groove of the humerus

7
Q

Pectoralis Major Innervation

A

Medial and lateral pectoral nn. [C5,*C6] (clavicular head)

[C7,C8,T1] (sternocostal head)

8
Q

Pectoralis Major Action

A
All fibers:
Medially rotate the shoulder
Adduct the shoulder
Clavicular head:
-Flexes the shoulder
-Horizontally adducts the shoulder
Sternocostal head:
-Extends the shoulder