Lecture 7: Upper limb & anterior forearm Flashcards
The arm is divided into anterior and posterior compartments by extensions of deep fascia called what?
Medial and lateral intermuscular septae
What is the anterior compartment of the arm occupied by?
Flexor compartment:
-Biceps brachii
-Coracobrachialis
-Brachialis
Innervated by the: Musculocutaneous nerve
What is the posterior arm compartment occupied by?
Extensor compartment:
-Triceps brachii
Innervated by the: Radial nerve
Origin & Insertion of the Biceps brachii:
Origin:
Short head-Coracoid process of scapula
Long head-Supraglenoid Tubercle of scapula
Insertion: Radial tuberosity and fascia of forearm via bicipital aponeurosis
Innervation: Musculocutaneous nerve
Origin & insertion of the Coracobrachialis:
Origin: Coracoid process of scapula
Insertion: Middle third of the medial surface of humerus
Innervation: Musculocutaneous nerve
Origin & Insertion of the Brachialis:
Origin: Distal half of the anterior surface of the humerus
Insertion: Ulnar tuberosity & coronoid process of ulna
Innervation: Musculocutaneous nerve
Origin & insertion of Triceps brachii:
Origin:
Long head- infraglenoid tubercle
Lateral head-Lateral, posterior humerus (superior to radial groove)
Medial head-Posterior surface of humerus (inferior to radial groove)
Insertion: Olecranon process of ulna
Innervation: Radial nerve
Where do the tendons of the forearm muscles pass through?
Distal part of the forearm and into the hand
What structures divide the forearm into anterior and posterior compartments?
Radius, Ulna, interosseous membrane, and intermuscular septum
Muscles of the anterior (flexor-pronator) forearm compartment are innervated by which nerve?
Median nerve
EXCEPT: FCU and medial half of FDP-these are innervated by the ulnar nerve
All muscles of the posterior (extensor-supinator) forearm compartment are innervated by which nerve?
Radial nerve
Most of the flexor-pronator muscles arise from the _______________ of the ____________ via _________________.
-medial epicondyle
-humerus
-common flexor tendon
The tendons of the flexor muscles of the forearm pass across _________ and are held in place by the ____________.
-the anterior surface of the wrist
-flexor retinaculum
The muscles of the anterior (flexor-pronator) compartment of the forearm are divided into three layers, what are these layers and which muscles are in each?
1) Superficial layer: Pronator teres(PT), flexor carpi radialis(FCR), palmaris longus (PL), flexor carpi ulnaris (FCU)
2) Intermediate layer: Flexor digitorum superficialis (FDS)
3) Deep layer: Flexor digitorum profundus(FDP), flexor pollicis longus (FPL), and pronator quadratus (PQ)
All muscles are innervated by the median nerve EXCEPT the FCU and medial half of the FDP-Ulnar nerve
The superficial layer of the extensor supinator muscles of the forearm are:
1) Brachioradialis (BR)
2) Extensor carpi radialis longus (ECRL)
3) Extensor carpi radiais brevis (ECRB)
4) Extensor digitorum (ED)
5) Extensor digiti minimi (Edm)
6) Extensor Carpi ulnaris (ECU)
7) Anconeus