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ANTERIOR COMPARTMENT OF ARM &CUBITAL FOSSA

FASCIAL COMPARTMENTS OF THE UPPER ARM

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COMPARTMENT

Muscles

Blood vessels

Nerves

Structures passingthrough thecompartment

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MUSCLES OF ANTERIORCOMPARTMENT

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MUSCLES OF ANTERIORCOMPARTMENT

b

coracobrachialis

rigin, insertion, N.S & Action

Dual N.S

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THE BICEPS BRACHII The biceps functions primarily as strong supintor of the forearm. This

action, which is aided by the supinatormuscle, reuires the elbow to be

at least prti!!" #e$e%. The biceps also functions as an poer'u! #e$or o' e!(o )oint,

particularly when the forearm is supinated. !unctionally, this action isperformed when lifting an ob"ect, such as a bag of groceries or whenperforming a biceps curl.

Both these movements are used when opening (ott!e it*

cor+scre# $rst biceps unscrews the cor% &supination', then it pulls thecor% out &(e)ion'.

*f the elbow "oint is fully e)tended, supination is then primarily carriedout by the supinator muscle.

e+ #e$or o' s*ou!%er )oint.

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+ont.

-hen the forearm isin pronation, the(rc*i!is,(rc*ior

%i!is,and supintorfunction to #e$ t*e'orer-, with minimalcontribution from the

biceps brachii.

!le)ed arm inthe pronte%position &left'with the biceps partiallycontracted and ina supinte%position with thebiceps more fully contracted,approaching minimum length&right.'

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+ont.

The brachialis muscle is innervatedby the musculocutaneous nerve,which runs on its super$cial surface,between it and the biceps brachii.

/art of it is also innervated by theradial nerve &proprioceptive branch'.

0ction# Most powerful (e)or at elbow"oint

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+ont.

Thecorco(rc*i!is draws the

humerus forward&shoulder(e)ion'andtowards the

torso &shoulderadduction'.

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STRUCTURES PASSIN THROUHANTERIOR FACIAL COMPARTMENT

BRACHIAL ARTER/

01

Muscu!r (rnc*es02

30

04

12

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RELATIONS OF BRACHIALARTER/

Anterior!"# Super$cial in the upper part,overlapped laterally by coracobrachialis andbiceps.

3pper part Medial cutaneous nerve of forearm

Middle part Median nerve

4ower part bicipital aponeurosis

Posterior!"5Triceps, coracobrachialis, brachialis

5 Lter!!"53pper part# Median nerve,coracobrachialis and biceps.

4ower part# tendon of bicepsMe%i!!"53pper part# ulnar nerve, basilic vein

4ower part# Median nerve

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NER6ES OF THE ANTERIORCOMPARTMENT

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MUSCULOCUTANEOUS NER6E

Origin

Course in r-

Brnc*es56. Muscular

7. +utaneous

8. 0rticular

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ME7IAN NER6E

Origin

Course5

Brnc*es5

9asomotor branchesto brachial artery

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ULNAR NER6E

Origin

Course in r-5

pierces the medialintermuscular septumand passes behind themedial epicondyle

Brnc*es5None

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RA7IAL NER6E

Origin

Course5in posterior thecompartment of arm andenters the anterior

compartment "ust abovethe lateral epicondyle bypiercing the lateralintermuscular septum

Brnc*es56. Muscular

7. 0rticular branches toelbow "oint

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CUBITAL FOSSAB:3ND0;*

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FLOOR OF CUBITALFOSSA

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ROOF OF CUBITAL FOSSA

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CONTENTS OF CUBITALFOSSA

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SUPRATROCHLEARL/MPH NO7ES

:ne or two suprtroc*!er!"-p* no%eslie in super$cialfascia over the upper part of fascia.

0re placed above the medialepicondyle of humerus, medial tothe basilic vein.

Their a=erents drainthe middle, ring, and little $ngers,the medial portion of the hand, andthe medial side of the forearm.

Their e=erents enter the laterala)illary lymph nodes

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CLINICAL CORRELATES

During blood pressuremeasurements, thestethoscope is placedo8er t*e (rc*i!rter" in the cubitalfossa.

The brachial pulse

may be palpated inthe cubital fossa also"ust medial to thetendon.

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+ont

The area "ust super$cial to thecubital fossa is often used forobtaining intravenous accessfor the purpose of intravenoustherapy or for blood sampling.