Flashcards
The forearm
Cards in this deck (9)
- 1What is the mobile wad?- Consists of three muscles:
- Brachioradialis
- Extensor carpi radialis brevis (ECRB)
- Extensor carpi radialis longus (ECRL)
- Grouped together because move during pronation and supination -> their function changes w/their position
- Means that these extensor muscles can have minimal flexor function - 2Why are extensor carpi radialis brevis and longus considered a part of the mobile wad?- They act as weak flexors at elbow joint
- Brevis moves arm from ulnar abduction to its mid-position + flexes dorsally
- Longus=weak pronator in flexed arm but supinator in outstretched arm - 3Why is the brachioradialis muscle considered a part of the mobile wad- Inserted distally on radius muscle unlike other muscles of the mobile wad ->thus acts only on forearm
- Brings forearm into midposition btwn supination and pronation ->in this position, acts as a flexor
- Additionally, in slow movements + in supinated forearm -> has minimal flexor action - 4What is the bicipitoradial bursa?- A bursa located between the distal tendon of the biceps brachii muscle and the anterior part of the tuberosity of the radius
- It ensures frictionless motion between the biceps tendon and the proximal radius during pronation and supination of the forearm. - 5What is the anular/annular ligament?- Annular ligament of radius
- Encircles proximal head of radius
- Attaches at anterior and posterior margins of the radial notch of the ulna
- The head of the radius rotates in the ‘socket’ created by the annular ligament - 6The muscles in the forearm can be divided in several ways, what are they?- Anterior and posterior
- Flexors and extensors
- Within either of the above two groups, muscles can be sorted based on how superficially or deeply they lie under the skin - anterior/flexors -> superficial, intermediate and deep + posterior/extensors -> superficial and deep - 7What are the muscles in the anterior arm and what groups can they be sorted into?- All muscles in anterior arm are flexors
- THEN:
.Superficial: flexor carpi ulnaris,
palmaris longus, flexor carpi radialis, pronator teres.
.Intermediate: flexor digitorum superficialis.
.Deep: flexor pollicis longus, flexor digitorum profundus and pronator quadratus. - 8What are the muscles in the posterior arm and what groups can they be sorted into?- All muscles in the posterior arm are extensors
- THEN:
.Superficial: brachioradialis, extensor carpi radialis longus, extensor carpi radialis brevis, extensor digitorum,
extensor digiti minimi,
extensor carpi ulnaris
.Deep: supinator, abductor pollicis longus, extensor pollicis brevis, extensor pollicis longus and extensor indicis.
- Anconeus also sometimes incl. in posterior forearm but sometimes posterior arm, some consider it just continuation of triceps brachii - 9—
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- undergrad Structural Basis of Human Function Flashcards on The forearm, created by Liberty Grisman-Hughes on 08/12/2021.
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- Liberty Grisman-Hughes
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