The anterior compartment of the forearm - deep muscles (dave's notes) Flashcards
What is the origin and insertion of flexor digitorum profundus?
Origin: The upper 3/4 of the anterior and medial surface of the ulna as far around as the subcutaneous border and narrow strip of the interosseous membrane
Insertion: Distal phalanges of the medial four fingers. Tendon to index finger separates early.
What is the action and innervation of flexor digitorum profundus?
Flexes the distal IP joints, then secondarily flexes the IP and MCP joints and wrist.
Median nerve
What is the origin and insertion of flexor pollicis longus?
Origin: Anterior surface of radius below the anterior oblique line and adjacent IO membrane.
Insertion: Base of the distal phalanx of the thumb
What is the action and innervation of flexor pollicis longus?
Flexes distal phalanx of thumb
Innervation is the anterior interosseous nerve of the median nerve (C8, T1)
List the deep muscles of the forearm and their innervation
Flexor digitorum profundus Median nerve
Flexor pollicis longus Anterior interosseous nerve of the median nerve C8, T1
Pronator quadratus - anterior interosseous nerve of the median nerve
What is the origin and insertion of pronator quadratus?
Origin: Lower quarter of the anteriomedial shaft of ulna
Insertion: Lower 1/4 of anteriolateral shaft of the radius and some interosseous membrane
What is the action and innervation of pronator quadratus?
Pronates the forearm and maintains radius and ulna opposed?
Nerve is the anterior interosseous nerve of the median nerve C8, T1
What space is infront of pronator quadratus?
The space of Parona
Where is the space of parona? What is its clinical significance?
In front of the pronator quadratus, deep to the long flexor tendons. It becomes involved in the proximal extension of the synovial sheath, and may carry infection.
