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shoulder muscles
action with attachments
16
Anatomy
Undergraduate 2
11/05/2008

Additional Anatomy Flashcards

 


 

Cards

Term

PECTORALIS MAJOR

 

O - Medial half clavicle, sternum and cartilage ribs 1-6

I - Crest greater tubercle humerus

Definition

Actions

All fibers:  Adduct shoulder, medially rotate shoulder, assist elevating thorax in forced inhalation

 

Upper fibers:   Flex shoulder (gh joint), horizontally adduct shoulder (gh joint)

 

Lower fibers:  Extend shoulder (gh joint)

Term

PECTORALIS MINOR

 

O - Ribs 1,2, and 3

I - Coracoid process of scapula

Definition

actions

*Depress scapula

*Abduct scapula

*Tilt scapula anteriorly

*Assist in forced inhalation when scapula fixed

Term

BICEPS BRACHII

 

O - (short head) Coracoid process of scapula

(long head) Supraglenoid tubercle scapula

I - Tuberosity of radius and aponeurosis bicep brachii

Definition

ACTIONS

 *Flex elbow (humeroulnar joint)

*Supinate forearm (radioulnar joint)

*Flex shoulder (glenohumeral joint)

Term

SERATTUS ANTERIOR

 

O - Surface upper 8 or 9 ribs

I - Anterior surface medial border scapula

Definition

Actions

With origin fixed:  Abduct scapula, depress scapula, hold medial border scapula against rib cage

 

If scapula fixed:  May act in forced inhalation

Term

DELTOID

 

O - Later 1/3 clavicle, acromion, spine of scapula

I - Deltoid tuberosity

Definition

Actions  (all act on glenohumeral joint)

 All Fibers:  Abduct shoulder

 

Anterior fibers:  Flex shoulder, medially rotate shoulder, horizontally adduct shoulder

 

Posterior fibers:  Extend shoulder, Laterally rotate shoulder, horizontally abduct shoulder

Term

TRAPEZIUS

 

O - External occipital protuberance, medial portion superior nuchal line of occiput, ligamentum nuchae, spinous processes C7-T12

I - Lateral 1/3 clavicle, acromion, spine of scapula

Definition

Upper Fibers: Extend head and neck (bilaterally)

(unilaterally)Latterally flex head and neck, same side.  Rotate head and neck opposite side, elevate scapula, upwardly rotate scapula

 

Middle Fibers:  Adduct scapula, stabalize scapula

 

Lower Fibers:  Depress scapula, upwardly rotate scapula

Term

LATTISIMUS DORSI

 

O - Spinous process T6-T12, ribs 8 or 9-12, thoracolumbar aponeurosis and posterior iliac crest

I - Crest lesser tubercle humerus

Definition

Actions:

 

 *Extend shoulder

*Adduct shoulder

*Medially rotate shoulder

Term

TERES MAJOR

 

O - lateral side inferior angle and lower half lateral border scapula

I - Crest of lesser tubercle humerus

Definition

Actions:

 (same as Lats)

 

*Extend shoulder

*Adduct shoulder

*Medially rotate shoulder

Term

ROTATOR CUFF MUSCLES

 

NAME THEM.......

Definition

 

 

*Supraspinatus

*Infraspinatus

*Subscapularis

*Teres Minor

Term

SUPRASPINATUS

 

O - Supraspinous fossa

I - Greater tubercle humerus

Definition

Actions:

 

*Abduct shoulder

*Stabalize head of humerus

Term

INFRASPINATUS

 

O - Infraspinous fossa scapula

I - Greater tubercle humerus

Definition

Actions:

 

*Latterally rotate shoulder

*Adduct shoulder

*Extend shoulder

*Horizontally abduct shoulder

*Stabalize head of humerus

Term

SUBSCAPULARIS

 

O - Subscapular fossa scapula

I - Lesser tubercle humerus

Definition

Actions:

 

*Medially rotate shoulder

*Stabalize head of humerus

Term

TERES MINOR

 

O - Superior 1/2 lateral border scapula

I - Greater tubercle humerus

Definition

Actions:

 

*Latterally rotate shoulder

*Adduct shoulder

*Extend shoulder

*Horizontal abduct shoulder

*Stabalize head of humerus

Term

TRICEPS BRACHII

 

O - Long head: Infraglenoid tubercle scapula

Lateral head: Posterior surface proximal half humerus

Medial head: Posterior surface distal half humerus

 

I - Olecranon process of ulna

Definition

Actions:

 

*Extend elbow

*Extend shoulder

*Adduct shoulder

Term

RHOMBOIDS

 

O - Spinous process C7-T5

I - Medial border scapula

Definition

Actions:

  

*Adduct scapula

*Elevate scapula

*Downwardly rotate scapula

Term

LEVATOR SCAPULA

 

O - Transverse process C1-C4

I - Upper region medial border superior angle scapula

Definition

Actions:

 

unilateral: Elevate scapula, downwardly rotate scapula, latterally flex head/neck, rotate head/neck same side

 

bilateral:  Extend head/neck

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