Lab 5: The Forearm
Terms
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- Which bone of the forearm articulates with the HUMERUS?
- The ULNA
- Which bone of the forearm articulates with the wrist?
- RADIUS
- What membrane connects the RADIUS and ULNA?
- INTEROSSEOUS MEMBRANE
- What type of joint exists between the RADIUS and ULNA?
- Syndesmosis
- What is the name of the point at the distal end of the RADIUS and ULNA?
- STYOID PROCESS
- What is the name of 'bump' of the elbow?
- OLECRANOON PROCESS
- Where does the PRONATOR TERES Originate?
- Epicondyl process of HUMERUS.
- What is the origin of the superficial flexors of wrist and digits?
- Common origin
- List Superficial flexors of wrist and digits in order from lateral to medial
-
PRONATOR TERES
FLEXOR CARPI RADIALIS
PALMARIS LONGUS
FLEXOR DIGITORUM SUPERFICIALIS
FLEXOR CARPI ULNARIS - Where does FLEXOR DIGITORUM SUPERFICIALIS insert?
- Second Phalanx of all fingers except thumb
- What are the deep flexor muscles of the wrist and digits?
-
FLEXOR POLLICIS LONGUS
FLEXOR DIGITORUM PROFUNDUS - Where does FLEXOR DIGITORUM PROFUNDUS Insert?
- Distal phalanx of all fingers except thumb.
- What differentiates BRACHIORADIALIS from the other anterior muscles of the forearm?
-
Action: Flexes forearm not wrist
Origin: Not Common Origin
Innervation: RADIAL NERVE - What muscles make up the "Anatomical snuff box"?
-
The TENDONS from:
ABDUCTOR POLLICIS LONGUS
EXTENSOR POLLICIS BREVIS
EXTENSOR POLLICIS LONGUS - What are the superficial Extensors of the wrist and digits from Thumb to Pinky?
-
EXTENSOR CARPI RADIALIS LONGUS
EXTENSOR CARPI RADIALIS BREVIS
EXTENSOR DIGITORUM
EXTENSOR DIGITI MINIMI
EXTENSOR CARPI ULNARIS - What action do muscles on the posterior of the forearm do to the thumb?
- Abduction
- What branches from the BRACHIAL ARTERY?
-
RADIAL ARTERY
ULNAR ARTERY - What branches from the ULNAR ARTERY?
-
COMMON INTEROSSEOUS ARTERY (very short)
Branches:
POSTERIOR INTEROSSEOUS ARTERY
ANTERIOR INTEROSSEOUS ARTERY - What is Innervated by the ULNAR NERVE?
-
FLEXOR CARPI ULNARIS
Medial 1/2 of FLEXOR DIGITORUM PROFUNDUS - What is Innervated by the MEDIAN NERVE?
- All flexor muscles except FLEXOR CARPI ULNARIS & MEDIAL 1/2 of FLEXOR DIGITORUM PROFUNDUS (ULNAR NERVE)
- What Innervates the Forearm Extensor Compartment
-
RADIAL NERVE itself
or via: POSTERIOR INTEROSSEOUS BRANCH - What Innervates the skin laterally from below the elbow to the wrist?
- LATERAL CUTANEOUS NERVE
- What does the MUSCULOCUTANEOUS NERVE become?
- LATERAL CUTANEOUS NERVE
- What causes a 'funny bone'?
- Entrapment of the ULNAR NERVE.
- What causes 'Wrist drop'?
- Lesion of the RADIAL NERVE.
- What nerve passes through the SUPINATOR?
- POSTERIOR INTEROSSEOUS NERVE (branch of RADIAL NERVE)