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Flashcards in Forearm muscles Deck (18):

What 2 muscles supinate the forearm?

Biceps Brachii
The tendon of the biceps brachii muscle and the supinator muscle both become wrapped around the proximal end of the radius when the hand is pronated. When they contract, they unwrap from the bone, producing supination of the hand.


What 2 muscles pronate the forearm?

Pronator teres
Pronator quadratus.
When these muscles contract, they pull the distal end of the radius over the ulna, resulting in pronation of the hand.


What is the function of the Anconeus?

Helps during pronation. Abducts the distal end of ulnato maintain the position of the palm of the hand over a central axis during pronation. Also some hinge-like flexion and extension at the elbow.


What are the 3 layers of muscles in the anterior compartment of the forearm?
What functions are the muscles associated with?

Superficial, intermediate, and deep layers.
Flexion and deviation of the wrist.
Flexion of the fingers and thumb
Flexion of the elbow.


What are the 2 layers of muscles in the posterior compartment of the forearm?
What functions are they associated with?

Superficial and deep layers.
Extension and deviation of the wrist.
Extension of the fingers and thumb.
Extension of the elbow.


Name the 4 Muscles of the Anterior Superficial Layer of Anterior Compartment of the Forearm.

Pronator teres
Flexor carpi radialis
Palmaris longus--sometimes missing.
Flexor carpi ulnaris


Name the muscle of the Intermediate Layer of the Anterior Compartment of the Forearm.

Flexor digitorum superficialis.


Which muscle in the anterior compartment has two heads and is shaped like a lightning bolt?

Flexor Digitorum Superficialis.


Name the 3 muscles of the Deep Layer of the Anterior Compartment of the Forearm.

Flexor Digitorum Profundus.
Flexor Pollicis Longus
Pronator Quadratus


What 2 nerve innervate the anterior compartment?

Medial and Ulnar.


Name the 6 muscles of the Superficial Layer of the Posterior Compartment of Forearm

Extensor Carpi Radialis Longus
Extensor Carpi Radialis Brevis
Extensor Carpi Ulnaris
Extensor Digitorum
Extensor Digiti Minimi


Name the 4 muscles of the Deep Layer of the Posterior Compartment of the Forearm.

Abductor Pollicis Longus
Extensor Pollicis Longus
Extensor Pollicis Brevis
Extensor Indicis.


Name the 3 muscles taht extend, abduct, and/or adduct the hand at the wrist.

Extensor carpi radialis longus.
Extensor carpi radialis brevis
Extensor carpi ulnaris


Name the 3 muscles that extend the medial four fingers.

Extensor digitorum
Extensor indicis
Extensor digit minimi


Name the 3 muscle that extend or abduct the thumb

Abductor pollicis longus
Extensor pollicis brevis
Extensor pollicis longus


What is the Extensor Retinaculum?

Flat tendon made of heavy fascia to hold the tendons in place at the wrist.


Describe 2 types of injury to the median nerve.

Compression under the flexor retinaculum (Carpal tunnel))
Ligament of Struthers: it is an embryological remnant from the coracobrachialis muscle that will compress the nerve...rare.


Describe transectio of the radial or ulnar arteries.

A hand through a plate glass window.
Radial and ulnar arteries are positioned sucutaneously and may be easily injured.
Dangerous but surgically repairable.