Lecture 10: Brachium, Cubital fossa Flashcards
Innervation to biceps brachii
Musculocutaneous nerve C5-6
Median nerve supplies
Flexor muscles on the radial side of the forearm
Does not supply muscles in the arm
Lateral antebrachial cutaneous nerve is from
Termination of musculocutaneous nerve
Innervation to posterior brachial compartment
Radial nerve
Functional neurological level - C7
Median nerve travels with what, and what is its relationship to that structure in space
Brachial artery
Lateral to artery in upper half of brachium, medial to artery in lower half of brachium
Vascularization of posterior brachial compartment
Deep brachial artery
Action of coracobrachialis
Weakly flexes and adducts arm
Posterior cutaneous nerve of arm is from
From radial nerve
Action of biceps brachii
Supination of forearm
Assists in forearm flexion
Distal attachment of anconeus
Lateral surface of olecranon process
Superior part of posterior surface of ulna
Nerves passing through posterior brachial compartment but not innervating
Median nerve Ulnar nerve (through proximal part)
Musculocutaneous nerve pierces
Coracobrachialis in upper half of brachium
Fascia lateral to biceps tendon
Innervation to coracobrachialis
Musculocutaneous nerve C6-7
Cubital fossa superior base
Line between two humeral epicondyles
Musculocutaneous nerve innervates
Muscles of anterior brachial compartment
Muscles of posterior brachial compartment
Triceps brachii
Anconeus
Cubital anastomosis
Brachial artery-Ulnar artery Deep brachial artery-Radial and interosseous arteries Superior ulnar col.-Posterior ulnar rec. Inferior ulnar col.-Anterior ulnar rec. Radial col.-Radial rec. Middle col.-Interosseous rec.
Cubital fossa medial boundary
Pronator teres muscle
Proximal attachment brachialis
Distal half of humerus and intermuscular septum
Triceps lateral and medial heads are _____-joint muscles
Triceps long head is _____-joint muscle
Lateral and medial heads are single-joint muscles
Long head is multi-joint muscle
Coracobrachialis is pierced by
Musculocutaneous nerve
Brachial artery is a direct continuation of the _____ and begins at
Axillary artery
Brachial A. begins at inferior border of teres major
Median nerve crosses ______ superficially
Median nerve crosses cubital fossa superficially along with the brachial artery, deep to the bicipital aponeurosis
Radial nerve pierces
Lateral intermuscular septum, distal to deltoid insertion
Branches of brachial artery
Deep brachial artery
Superior ulnar collateral artery-to posterior ulnar rec.
Inferior ulnar collateral artery-to anterior ulnar rec.
Action of brachialis
Main flexor of forearm
Cubital fossa roof
Skin, superficial & deep fascia, bicipital aponeurosis
Radial nerve supplies
Extensor muscles in posterior compartment of brachium as well as extensor muscles of wrist and hand (all extensor muscles of upper extremity)
Brachioradialis muscle
Distal attachment brachialis
Tuberosity of coronoid process
Distal attachment biceps brachii
Tuberosity of radius
Proximal attachment anconeus
Posterior aspect of lateral epicondyle of humerus
Ulnar nerve supplies
Flexor muscles on the ulnar side of the forearm
Medial brachial cutaneous nerve is from
Direct branch from medial cord
Function of muscles of anterior brachial compartment
Forearm flexors
Biceps also flexes shoulder and supinates forearm
Cubital fossa floor
Supinator and brachialis muscles
Ulnar nerve course through arm
Medial to brachial artery
Runs with superior ulnar collateral artery
Pierces medial intermuscular septum
Enters posterior compartment of brachium
Passes around medial epicondyle
Passes into forearm between two heads of flexor carpi ulnaris muscle
Proximal attachment biceps brachii- long and short heads
Short head from tip of coracoid process
Long head from supraglenoid tubercle of scapula
Radial nerve divides into
Superficial and deep branches near lateral epicondyle
Radial branches in distal third of arm
Branch to brachioradialis
Branch to extensor carpi longus
Articular branches to elbow joint
Proximal attachment coracobrachialis
Tip of coracoid process
Vascularization of anterior brachial compartment
Brachial artery
Basilic vein and venae comitantes
Radial nerve passes into forearm between
Between the brachialis muscle medially and the brachioradialis muscle laterally
Distal attachment of triceps
Olecranon process
Radial nerve branches in the axilla and upper third of arm
Muscular branch to long and medial heads of triceps
Posterior brachial cutaneous nerve
Lateral intermuscular septum
From subcutaneous sheath to humerus
Separates muscles of anterior arm from lateral side of triceps complex
Innervation to brachialis
Musculocutaneous nerve C5-6
Action of anconeus
Abducts ulna during pronation of forearm
Assists triceps during forearm extension
Proximal attachment of lateral head triceps
Posterior surface of humerus above radial groove
Distal attachment of coracobrachialis
Middle third of medial border of humerus
Innervation to anterior brachial compartment
Musculocutaneous nerve
Functional neurological level C5-6
Cubital fossa contents- lateral to medial
Biceps tendon T-tendon Brachial artery A-artery Median nerve N-nerve Bifurcation of brachial/radial arteries Brachial veins Bicipital aponeurosis Radial nerve
Radial branches in radial groove in middle third of arm
Branch to lateral and medial triceps and anconeus
Lower lateral brachial cutaneous nerve
Posterior cutaneous nerve of forearm
Nerves that pass through anterior brachial compartment but do not innervate area
Median nerve Ulnar nerve (through proximal part)
Proximal attachment of long head triceps
Infraglenoid tubercle of scapula
Function of muscles of posterior brachial compartment
Forearm extensors
Long head of triceps can extend shoulder
Synergists in forearm supination
Venae comitantes
Veins that parallel arteries-
Usually two per artery
Countercurrent heat exchange
Superior lateral cutaneous nerve of arm is from
From axillary nerve
Musculocutaneous nerve continues as
Lateral cutaneous nerve of the forearm, supplying skin on lateral forearm as far as wrist
Action of triceps
Forearm extension
Long head also assists in arm extension
Radial nerve descends
Posterior to the axillary artery, spirals around posterior surface of humerus in the spiral groove along with the brachial artery
Median cubital vein
Connects cephalic and basilic vein
Extends diagonally across bicipital aponeurosis
Receives blood from median antebrachial vein
Drains blood from palmar hand
Proximal attachment of medial head triceps
Posterior surface of humerus below radial groove
Innervation of anconeus
Radial nerve C7-8, T1
Basilic vein
Medial continuation of dorsal venous arch
Ascends in superficial fascia along lateral aspect of arm and forearm to middle of arm
Pierces deep fascia and ascends in upper aspect of arm in deep fascia
Joins venae comitantes to form axillary vein (usually near inferior border of teres major)
Medial intermuscular septum
From subcutaneous sheath to humerus
Separates muscles of anterior arm from medial side of triceps complex
Posterior cutaneous nerve of forearm is from
From radial nerve
Medial antebrachial cutaneous nerve is from
Direct branch from medial cord
Cubital fossa lateral boundary
Brachioradialis muscle
Cephalic vein
Lateral continuation of dorsal venous arch
Ascends in superficial fascia along lateral aspect of forearm and arm
Passes through deltopectoral triangle
Empties into axillary vein
Innervation to triceps
Radial nerve C6-8
Muscles of anterior brachial compartment
Biceps brachii
Coracobrachialis
Brachialis