Muscles of the forearm and wrist, hand Flashcards
What does the biceps brachii do?
Flex elbow, supinates forearm (feel it!)
Where do the 2 heads of the biceps brachii originate?
Long head to the supraglenoid tubercle thru the bicipital groove; short head to the coracoid process of the scapula
Where does the biceps brachii insert?
Inserts at radial tuberosity of radius
What does the brachialis do?
Flexes elbow
Where is the brachialis?
Humerus to coronoid process of the ulna
What does the brachioradialis do?
Flexes elbow
Where is the brachioradialis?
Humerus to styloid process of the radius
What does the triceps brachii do?
Extend elbow
Where is the triceps brachii?
Origin of the long head is the infraglenoid tubercle
What does the supinator do?
Supinates forearm and hand
What muscle is the antagonist of the supinator?
Pronator teres
What muscles come off the coracoid process?
Biceps brachii; Pectoralis minor; coracobrachialis
Which muscles extend the elbow?
Triceps brachii
Which muscles flex the elbow?
Biceps brachii, brachialis, brachioradialis
What are the two powerful wrist flexors?
flexor carpi radialis
flexor carpi ulnaris
What is the weak wrist flexor?
Palmaris longus
How the the flexor carpi radialis move?
Radial flexion and deviation of wrist → to thumb side
How the the flexor carpi ulnaris move?
Ulnar flexion and deviation of wrist → to pinkie side
Which muscle tenses the skin and fascia of the palm during hand movements?
Palmaris longus
The palmaris longus is superficial to the _______ _______, and the ________ ______ is deep to the palmaris longus.
Flexor retinaculum
Median nerve
The palmaris longus is medial to ________.
flexor carpi radialis
What does the extensor carpi ulnaris do?
Extends wrist, ulnar deviation of wrist
When and what does the extensor carpi ulnaris fix?
Fixes the wrist when the fist is clenched, eg a punch
What extends the fingers?
extensor digitorum
What extends wrist while extending fingers?
Extensor digitorum
The extensor digitorum adducts or abducts the fingers?
Abducts
Flexion occurs in the ________ forearm, while extension occurs in the ________ forearm.
Anterior
Posterior
Which muscles flex in the forearm?
flexor carpi radialis, flexor carpi ulnaris, palmaris longus
Which muscles extend in the forearm?
extensor carpi ulnaris, extensor digitorum
