Primate ANT Forearm

  1. Pronator TeresImage Upload 2
    • Origin: Humerus: medial epicondyle
    • Insertion: Radius: middle 1/3 of lateral shaft
    • Nerve: Median
    • Action: Pronates forearm (its main function), flexes forearm
    • Comparative Anatomy: Humans and Apes:
    • Pronator teres has 2 heads of origin:
    •    Humeral head: already described
    •    Ulnar or deep head: arises from the medial border of the coronoid process.
  2. Image Upload 4
    Flexor Carpi Radialis
    • Origin: Humerus: medial epicondyle
    • Insertion: Metacarpal II: base
    • Nerve: Median
    • Action: Flexes hand at wrist
  3. Image Upload 6
    Palmaris Longus
    (This is the most superficial of the forearm flexors.)
    • Origin: Humerus: medial epicondyle
    • Insertion: Palmar aponeurosis
    • Nerve: Median
    • Action: Tenses palmar aponeurosis; slightly flexes hand at wrist
    • CA: Humans:Muscle may be totally absent in up to 15% of human individuals. check both arms to see if you have this muscle.
  4. Image Upload 8
    Flexor Carpi Ulnaris
    • Origin:Humeral head: humerus, medial epicondyle; Ulnar head: ulna, medial surface of olecranon process
    • Insertion: Pisiform
    • Nerve: ulnar
    • Action: Flexes hand at wrist
  5. Epitrochleoanconeus
    (this muscle occurs more frequently in lower primates and only occasionally in humans and apes)
    • Origin: Humerus: medial epichondyle
    • Insertion: Ulna:olecranon process
    • Nerve: Ulnar
    • Action: aBducts olecranon in lower animals
    • CA: Humans: Approximately 1 in 4 humans will have this small muscle which is called Epitrochleoolecranonis in human anatomy books.
  6. Image Upload 10
    Flexor digitorum superficialis
    • Origin: Humerus: medial epicondyle; Joint capsule of elbow
    • Insertion: Middle phalanges, digits II-V, ventral surfaces.
    • Nerve: Median
    • Action: Flexes middle phalanges and when acting more strongly flexes the wrist.
    • CA: In human primates and large apes, this muscle has an ulnar and radial head in addition to its humeral head.
  7. Flexor digitorum Profundus
Author
hyfong123
ID
263416
Card Set
Primate ANT Forearm
Description
Lab study
Updated