Slides of Anatomy

Please note : These slides are Dr. Maher Hadidi’s slides of spring 2016

and were edited by the Premed Academic Team to fit the slides of

spring 2019.

Spring 2019 Dr. Maher Hadidi, University of Jordan

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Upper LimbLecture 5

Upper Arm

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Scapula- Lateral view

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UlnaRadius

Colles fracture

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Cross section in the Arm

Has the following layers:1. Skin2. Superficial fascia, contain:

a. 2 veinsb. Fat

3. Deep fascia, sends 2intermuscular septums to the supracondylar ridges of humerus, dividing the arm into 2 compartmentsAnt.& Post. Each has:••

Its own muscles. Its nerve supply.

• Its arterial supply.• Its main action.

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Anterior

compartment

of Arm

◼ Has 3 muscles• Biceps.

• Coracobrachialis.

• Brachialis.

◼ All supplied by musculocutaneous nerve.

◼ All supplied by brachial artery.

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Muscles

1.Biceps brachii

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2. Coracobrachialis

3. Brachialis

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Brachial

artery➢Begin.

➢End.

➢Branches 3

• Profunda brachii a.

• Sup. ulnar. collateral a.

• Inf. ulnar. collateral a.

➢Course

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Brachial artery- Course

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Musculocutaneous nerve

➢ From lateral cord.

➢ Pierce corac-obrachialis M.

➢ Between 2,3.

➢ Continue aslateral cutaneous nerve of forearm

◼ Supply:• 3 muscles.

• Skin.

• Elbow joint.

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Ulnar nerve

➢ From medial cord.

➢ Medial to brachial a. in ant. compartment.

➢ Pierce medial septum to enter the posterior compartment.

➢ Pass behind medial epicondyle of humerus.

➢ Accompanied by two ulnar collat. arteries.

➢ Supply: Ø in upper arm.

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Median nerve

◼ From Med & Lat.cords.

◼ Relations to brachial A.

• Upper Lateral.

• Middle Anterior.

• Lower Medial.

◼ Enter cubital fossamedially.

◼ Supply: Ø nothing inupper arm.

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Posterior compartment of Arm

• 1 muscle with 3 heads (Triceps).

• Origin by 3 Heads:

• Long →infraglenoid

tubercle.

• Lat. → Humerusabove radial groove.

• Med. → Humerusbelow radial groove.

• Ins.: Olecranon proc.

• NS: Radial nerve.• Action: Extends elbow.• Supplies by Profunda

brachii artery.

Radial nerve

◼ From posterior cord.

◼ Largest branch of brachial plexus.

◼ Pass posterior to axillary a.

◼ In the axilla, givebranches to the long head and medial head of triceps (LM).

◼ Leave medial and lateral to the humerus, enter theposterior compartment.

Medial

to humerus

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Radial nerve

▪ In the posterior compartment, pass within the radial groove and between Medial & Lateral heads of triceps accompanied with profunda brachii artery.

▪ Supply: (ML).▪ At lower part, it pierce lateral

septum to enter anterior compartment to pass inside cubital fossa.

Radial nerve injury

Fracture site

▪ Fracture of midshaftof the humerus, may involve the radial nerve in the spiral groove. Causing paralysis of muscles distal to that site.

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