anterior compartment of cubital fossa and arm_medicosnotes.com
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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.