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Forelimb - Anatomy & Physiology (view source)

Revision as of 12:40, 15 August 2008

70 bytes removed , 12:40, 15 August 2008

→‎Muscles of the Shoulder

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====Muscles of the Shoulder====

These muscles are grouped:

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*Lateral:'''Supraspinatus ''' and '''Infraspinatus'''

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*Lateral:'''Supraspinatus ''' and '''Infraspinatus''', Suprascapular n. of the brachial plexus

**Origin: the fossae of the scapula

**Insertion: both tubercles of the humerus

**Action: brace the shoulder

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**Innervation: Suprascapular n. of the brachial plexus

**Clinical significance: bursa between the tendon of the infraspinatus and lateral tubercle of the humerus can be the site of inflammation

*Medial:

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**'''Supscapularis'''

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**'''Supscapularis''': Subscapular n. from the brachial plexus

***Origin: Deep surface of the scapula

***Insertion: medial tubercle of the humerus

***Action: braces medial shoulder joint, potential adductor

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***Innervation: Subscapular nerve from the brachial plexus

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**'''Coracobrachialis''': Musculocutaneous n. of the brachial plexus

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**'''Coracobrachialis'''

***Origin: medial supraglenoid tubercle

***Insertion: proximal shaft of the humerus

***Action: fixator

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***Innervation: ~~Musculocutaneous nerve~~ of the brachial plexus

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*Caudal (Flexors): Axillary n. of the brachial plexus

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*Caudal (Flexors):

**'''Deltoids'''

***Origin: caudal border and spine of the scapula

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**'''Teres Minor'''

**Actions: Act together to flex the shoulder joint

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**Innervation: Axillary nerve of the brachial plexus

*There are no defined extensors of the shoulder. Those involved (brachiocephalic m., biceps brachii, supraspinatus, and ascending pectorals) have other, more primary roles.

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====Muscles of the Elbow====

Bepocock

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