12/4; The Arm and Cubital Fossa
Medial Antibrachial Cutaneous Nerve
(not shown)
Lateral Cutaneous nerve of forearm (lateral antebrachial cutaneous nerve)
(terminal musculocutaneous nerve) Nerve innervates muscles of anterior compartment of arm.
Coracobrachialis: Actions:
- flexes & adducts arm at shoulder joint - resists dislocation of shoulder joint
Biceps brachii: Innervation:
- musculocutaneous nerve (C5, C6)
Brachialis: Innervation:
- musculocutaneous nerve (C5, C6) - Lateral portions may receive radial nerve contributions
Coracobrachialis: Innervation:
- musculocutaneous nerve (C5, C6, C7)
Coracobrachialis: Proximal Attachment:
-coracoid process of scapula
Brachialis: Distal Attachment:
-coronoid process and tuberosity of ulna
Brachialis: Proximal Attachment:
-distal 1⁄2 of anterior surface of humerus
Brachialis: Actions:
-flexes forearm at elbow joint
Biceps brachii: Proximal Attachment:
-long head: supraglenoid tubercle of scapula -short head: coracoid process of scapula
Coracobrachialis: Distal Attachment:
-middle 1/3 of medial humeral surface
Biceps brachii: Distal Attachment:
-radial tuberosity and fascia of forearm via bicipital aponeurosis
Biceps brachii: Actions:
-supinates forearm, when supine willflex forearm -resists dislocation of shoulder (short head)
Cubital Fossa: Superficial Structures
Basilic vein travels just lateral to neurovascular bundle (median nerve with brachial artery) Muscles Arteries just look at them
Cubital Fossa: Subcutaneous Structures
Cephalic, basilic, and median cubital vein. median antibrachial vein Lateral Cutaneous nerve, Mesial cutaneous nerve of forarm
Vasculature of Arm & Forearm
Continuing Path of Blood SupplyFrom Arm (brachium) into Forearm (antebrachium)
Posterior to the Cubital Region:
Elbow Region • triceps and olecranon process • anconeus (red star)
Cubital Fossa: Deep Structures
Median nerve travels between two heads of pronator teres
What are the 2 neurovascular bundles found in the anterior compartment?
Median nerve with brachial artery and veins Ulnar nerve with collateral artery and veins
Triceps and biceps brachii do what:
Mitigate so you don't hyperextend or anything
Anterior Flexor compartment muscles innervated by:
Musculocutaneous nerve
superior lateral cutaneous nerveof arm (superior lateral brachial cutaneous nerve)
Originates from axillary nerve
Posterior (extensor) compartment is innervated by:
RADIAL NERVE
What is the neuromuscular bundle found in the posterior compartment?
Radial nerve with collateral arteries and vein
What divides the anterior and posterior aspects of the arm?
The Medial and Lateral intermuscular septa
Musculature of the Arm: Anterior (Flexor) Compartment
biceps brachii long head, short head brachialis coracobrachialis
Where do supraclavicular nerves come from?
branches of the cervical plexus, not brachial plexus
Medial cutaneous nerve of arm (medial brachial cutaneous nerve)
cutaneous innervation to the rest of the mesial aspect of the arm
Posterior compartment
extensors
Anterior compartment
flexors
The Cubital Fossa:
junction between the arm (brachium) & forearm regions (antebrachium)
Muscles that flex are innervated by
medial or lateral cord
Muscles that extend are innervated by
posterior cord
posterior ulnar recurrent artery also runs ____ to ____ epicondyle
posterior; medial
ulnar nerve runs _____ to ____ epicondyle of humerus
posterior; medial
First branch of brachial artery
profunda brachii artery (deep brachial artery) splits to post. (middle collateral) and ant. descending (radial collateral) branch
Intercostaobrachial nerve (T2 intercostal nerves)
provides cutaneous innervation to the mesial aspect of the arm. Responsible for referred pain on left side of the heart (radiating pain down left limb sign of heart attack)
Posterior cutaneous nerve of arm (posterior brachial cutaneous nerve)
radial nerve organ. Posterior cutaneous innervation
Posterior (Extensor) Compartment
triceps brachii (long, lateral, and medial head) anconeus
Median nerve travels through
two heads of pronator teres
