Unit 2.7 Flashcards
Zip code for forearm
41375
Anterior superficial forearm muscles
Probnator teres
Flexor carpi radial is
Palamris longus
Flexor carpi ulnaris
Anterior intermediate forearm muscles
Flexor digitorum superficialis
Anterior deep forearm muscles
Flexor policies longus
Flexor digitorum profundus
Pronator quadratus
Posterior superficial forearm muscles
Brachioradials, extensor carpi radialis longus, extensor carpi radialis brevis, extensor digitorum, extensor digiti minimi, extensor carpi ulnaris, anconeus
Posterior deep forearm muscles
Supinator, abductor policies longus
Lies largely in the frontal plane and can serve as a dividing line between the anterior and posterior
Brachioradials
The muscles at the lateral most surface of the forearm is named for the lateral most bone (_) and across on the
Radius
Wrist and carpus
The muscles on the medial border of the forearm is named for the medial bone (_) and acts on the
Ulna
Carpus and digita
The muscles between the outer most border acts on
Digits
The name of each muscle describes
Action, insertion and position within the compartment
Anterior forearm compartment action
Originate from
Insert
Innervation
Flex carpus and digits
Medial epicondyle
Carpus on carpus and digits on digits
Median or ulnar nerve
Posterior forearm compartment action
Originate
Insertion
Innervation
Extend carpus and digits
Lateral epicondyle
Carpus on carpus and digits on digits
Radial nerve
Flexor carpi ulnaris action
Antagonist to
Synergist to
Example
Flex the wrist and adduct the carpus
Extensor carpi ulnaris when the action is flexion. All extensors if the wrist
Extensor carpi ulnaris when the action is adduction
Unipennate
Flexor carpi radialis origin
Insertion
Fibers course
Action
Antagonist to
Synergist to
Medial epicondyle of humerus
Lateral wrist
Superior to inferior and do not cross the elbow to insert at the medial wrist. They are inferior to the central axis of the elbow and don’t have an action on the joint
Flex and abduct the carpus
Extensor carpi radialis when flexion. All extensors of the wrist
Extensor carpi radialis when abduction
Palmaris longus action
Antagonist to
Synergist to
Weak flexor of the wrist
Extensors of the wrist
Flexors of the wrist
Not an antagonist or Synergist to muscles of the digits because it doesn’t act in them
Flexor digitorum superficialis origin
Insertion
Fibers course
Joint
Action
Antagonist to
Synergist to
Medial epicondyle of the humerus and coronoid process if the ulna
Middle phalanges of digits 2-5
Superior to inferior
Crosses elbow joint due to origin being in the ulna which is above the central axis
Flexes the wrist, the metacarpal phalangeal joints and proximal phalangeal joints of digits 2-5
Extensors of the carpus and digits
Flexors of the wrist and phalanges
Flexor digitorum profundus action
Joint
Antagonist to
Synergist to
Flexes the wrist, the metacarpal phalangeal joints and proximal phalangeal joints of digits 2-5
Crosses elbow joint due to origin being in the ulna which is above the central axis
Extensors of the carpus and digits
Flexors of the wrist and phalanges
Flexor policies longus action
Act on elbow?
Antagonist to
Synergist to
Flexes the thumb
No because origin is radius
Extensor pollicis longus
Flexor pollicis brevis
Muscles of anterior forearm that actions the position of the hand
Probator teres, pronator quadratus
Pronator teres action
Example
Rotates the proximal radius around the ulna and assist to pronate the hand, pronation of the forearm at the elbow
Unipennate
Pronator quadratus action
Antagonist to
Synergist to
Example
Rotate the distal radius around the ulna to assist to pronate the hand, pronation do the forearm at the wrist
Supinator
Pronator teres
Parallel
Muscles of the posterior compartment move the
Forearm at the elbow and digits
Posterior forearm muscles that acts on the position of the hand
Supinator, extensor carpi ulnaris, extensor carpi radialis longus and brevis
Supinator action
Antagonist to
Synergist to
Rotates the radius laterally around the ulna to supinate the hand
Pronator teres and Pronator quadratus
Biceps brachii long and short head
Extensor carpi ulnar origin
Insertion
Fibers course
Action
Antagonist to
Synergist to
Example
Lateral epicondyle of the humerus
Medial wrist, base of metacarpal 5
Superior to inferior and don not cross the elbow to insert at the medial wrist. They are jnferior. To the central axis of the elbow so don’t act on it
Extend the carpus and adduct the wrist
Flexor carpi ulnaris when extended. All flexor is the wrist
Flexor carpi ulnaris when adducted.
Unipennate
Extensor carpi radialis longus action
Antagonist to
Synergist to
Extend and abduct the wrist and carpus
All flexors of the wrist
Flexor carpi radialis when abducted
Extensor carpi radialis brevis action
Antagonist to
Synergist to
Extend and abduct the carpus
Flexor carpi radialis when extended. All flexors of the wrist
Flexor carpi radialis when abducted
Muscles of the posterior forearm that acts on the digits
Extensor digitorum, abductor pollicis longus, extensor pollicis longus and brevis, extensor indicis, extensor digit minimi
Extensor digitorum origin
Insertion
Fibers course
Action
Antagonist to
Synergist to
Example
Lateral epicondyle of humerus
Middle and distal phalanges of digits 2-5
Superior to inferior
Extends the wrist, the metacarpal phalangeal joints and the distal inter phalangeal joints of digits 2-5
Flexors if the carpus and digits
Extensors of the wrist and phalanges
Multipennate
Abductor pollicis longus action
Antagonist to
Synergist to
Abducts the thumb and weakly extends the wrist
Flexors of the pollicis and the wrist
Extensors of the wrist
Extensor pollicis longus action
Antagonist to
Synergist to
Know as
Extends the thumb and weakly wrist
Flexor pollicis longus and flexors of the wrist
Extensor pollicis longus and extensors of the wrist
Hockey stick muscle
Extensor pollicis brevis action
Antagonist to
Synergist to
Extends the metacarpal phalangeal joint of the thumb and weakly extends wrist
Flexor pollicis longus and flexors of the wrist
Extensor pollicis longus and extensors of the wrist
Extensor indicis action
Antagonist to
Synergist to
Extends the metacarpal phalangeal, proximal and distal interphalangeal joints of digit 2
Flexor digitorum superficialis and profundus
Extensor digitorum longus
Extensor digiti minimi action
Antagonist to
Synergist to
Extend the wrist and the metacarpal phalangeal proximal and distal interphalangeal joints of digit 5
Flexor digitorum superficialis and profundus and flexors of the carpi
Extensor digitorum and extensors of the wrist
Thenar muscles
Creates the dense pad of tissue associated with palm
Actions occur at digit 1 and implies the name
Innervated by median nerve
Abductor pollicis brevis, flexor pollicis brevis, opponents pollicis
Abductor pollicis brevis action
Abducts the thumb
Flexor pollicis brevis action
Flexion of thumb
Opponents pollicis action
Opposition of the thumb- showing 4 fingers
Hypothenar muscles
Creates the pad of tissue associated with the anterior and medial surface of the palm
Innervation by ulnar nerve
Abductor digiti minimi, flexor digiti minimi brevis, opponents digiti minimi
Abductor digiti minimi action
Abduction of digit 5
Flexor digiti minimi brevis action
Flexion of digit 5
Opponents digiti minimi action
Opposition of digital 5, pinky towards middle of palm
Small muscles of the hand- mid carpal muscles
Act on metacaprlas
Innervated by the ulnar nerve with the exception of the lumbricals
Lumbricals are innervated by the median nerve
Adductor pollicis, lumbricals, dorsal and palmar interossei
Adductor pollicis action
Adduction of the thumb
Lumbricals (1-4) action
Move digits (z position) flexion at the metacarpal phalangeal joints
Dorsal interossei action
Abduction of the digits
Palace interossei (1-3) action
Adduction of the digits
