Anterior compartment of arm & cubital fossa Dr.N.Mugunthan
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This document summarizes the anatomy of the anterior compartment of the arm and cubital fossa. It describes the three muscles of the anterior compartment - coracobrachialis, biceps brachii, and brachialis. It details the nerve innervation, origins, insertions and actions of each muscle. It then describes the boundaries, contents, and applied significance of the cubital fossa, including the median cubital vein.
Anterior compartment of arm & cubital fossa Dr.N.Mugunthan
- 1. ANTERIOR COMPARTMENT OF ARM & CUBITAL FOSSA Dr.N.Mugunthan. MS,DNB,MNAMS,PhD,MBA (Hosp.Admin.) Professor of Anatomy SMIMS
- 2. LEARNING OBJECTIVES Muscles of front of arm Nerve supply & actions Cubital fossa Boundaries Contents Applied anatomy © Dr.N.Mugunthan
- 3. FAQ Musculocutaneous nerve Biceps brachi muscle Brachialis muscle Cubital fossa Median cubital vein © Dr.N.Mugunthan
- 4. ARM OR BRACHIUM Arm extends from the shoulder joint to the elbow joint. Medial & lateral intermuscular septa divide the arm into an anterior or flexor compartment and posterior or extensor © Dr.N.Mugunthan
- 5. FLEXOR COMPARTMENT OF ARM Muscles • Coracobrachialis • Biceps brachii • Brachialis Nerves in the arm • Musculocutaneous nerve (nerve of the arm) • Median nerve • Ulnar nerve • Radial nerve Artery • Brachial artery © Dr.N.Mugunthan
- 6. MUSCLES OF ANTERIOR COMPARTMENT OF ARM © Dr.N.Mugunthan
- 7. CORACOBRACHIALIS Origin: tip of the coracoid process with conjoint origin of short head of biceps Insertion: medial border of the middle of the shaft of the humerus © Dr.N.Mugunthan
- 8. Nerve supply Musculocutaneous nerve Coracobrachialis is pierced by musculocutaneous nerve Action Flexes the arm CORACOBRACHIALIS CONT…. © Dr.N.Mugunthan
- 10. BICEPS BRACHII Origin: Short head: From Coracoid process with conjoint origin of coracobrachialis Long head: Intracapsular origin- supraglenoid tubercle of scapula © Dr.N.Mugunthan
- 11. The tendon of Long head of biceps curves above the humeral head Pierces the capsule Courses beneath transverse humeral ligament Lodges in the intertubercular sulcus (bicipital groove) BICEPS BRACHII CONT…. © Dr.N.Mugunthan
- 12. Long head fuses with short head to form a muscle belly about 7 cm above elbow joint. BICEPS BRACHII CONT…. © Dr.N.Mugunthan
- 13. INSERTION OF BICEPS BRACHI Muscle belly turns to a tendon which runs in cubital fossa. Inserted to posterior part of radial tuberosity in a twisted manner Before insertion medial part expand to form bicipital aponeurosis © Dr.N.Mugunthan
- 14. Nerve Supply: Musculocutaneous nerve Action: 1. Powerful supinator 2. Flexor of elbow joint 3. Long head keeps humeral head inside the glenoid cavity during abduction of shoulder joint BICEPS BRACHII CONT…. © Dr.N.Mugunthan
- 15. APPLIED ANATOMY OF BICEPS Biceps jerk © Dr.N.Mugunthan
- 16. APPLIED ANATOMY OF BICEPS CONT…. © Dr.N.Mugunthan
- 17. BRACHIALIS Origin • Lower part of the anteromedial and anterolateral surface of the humerus • From the lower part of spiral groove • From medial intermuscular septum Insertion • Ulnar tuberosity & coronaoid process of ulna © Dr.N.Mugunthan
- 18. Nerve supply - Dual Major part of muscle supplied by musculocutaneous nerve Small lateral part supplied by radial nerve Action: Flexes elbow joint BRACHIALIS CONT…. © Dr.N.Mugunthan
- 19. SUMMARY OF MUSCLES OF FRONT OF ARM
- 21. SUMMARY OF MUSCLES OF FRONT OF ARM © Dr.N.Mugunthan
- 23. Definition Situation Shape Boundaries Contents Applied significance CUBITAL FOSSA CONT… © Dr.N.Mugunthan
- 24. CUBITAL FOSSA Definition: a triangular space in front of the elbow joint © Dr.N.Mugunthan
- 25. Boundaries : Base Lateral Medial Apex Roof Floor CUBITAL FOSSA CONT… © Dr.N.Mugunthan
- 26. CUBITAL FOSSA CONT… Boundaries: 1. Base: an imaginary line between the 2 epicondyles of humerus 2. Laterally: medial border of brachioradialis 3. Medially: lateral border of pronator teres 4. Apex: brachioradialis overlaps pronator teres © Dr.N.Mugunthan
- 27. CUBITAL FOSSA CONT… Roof: 1. Skin 2. Superficial fascia containing: cephalic vein, lateral cutaneous nerve of forearm, basilic vein, medial cutaneous nerve of forearm & medial cubital vein 3. Deep fascia 4. Bicipital aponeurosis Floor: 1. Brachialis (medially) 2. Supinator (laterally) © Dr.N.Mugunthan
- 28. Contents: From medial to lateral: (MBBS) 1. Median nerve 2. Termination of Brachial artery & beginning of radial & ulnar arteries 3. Tendon of Biceps brachii 4. Superficial branch of Radial nerve CUBITAL FOSSA CONT… © Dr.N.Mugunthan
- 29. Applied anatomy: Median cubital vein Blood pressure measurement CUBITAL FOSSA cont…. © Dr.N.Mugunthan
- 31. TAKE HOME MESSAGE Musculocutaneous nerve Biceps brachi muscle Brachialis muscle Cubital fossa Median cubital vein © Dr.N.Mugunthan