Unit Two Antebrachial Extensors Flashcards
The posterior compartment is all innervated by what
Radial nerve or branches
What are the three functional groups of the extensors
Muscles that extend and abduct or adduct the hand at wrist, muscle that extend the medial four digits, muscles that extend or abduct the thumb
What muscles extend and abduct or adduct the hand at the wrist
Extensor carpi radialis brevis longus, extensor carpi radialis brevis, extensor carpi ulnaris
What muscles extend the medial four digits
Extensor digitorum, extensor indicis, extensor digiti minimi
What muscles extend or abduct the thumb
Abductor pollicis longus, extensor pollicis brevis, extensor pollicis longus
What muscles attach to the lateral supraepicondylar ridge of humerus and adjacent intermuscular septum
Brachioradialis and extensor carpi radialis longus
What muscles have attachments to the common extensor tendon to the lateral epicondyle
Extensor carpi radialis brevis, extensor carpi ulnaris, extensor digitorum, and extensor digiti minimi
What are the deep extensor muscles
Abductor pollicis longus, extensor pollicis brevis, extensor pollicis longus, extensor indicis
The extensor carpi radialis longus has a synergistic function with finger flexors because
It keeps the wrist extended to allow increased grip strength
What muscle has its own sheath
Extensor digiti minimi
What restricts independent extension at the MCP joints of the digits except the index and 5th digit
Oblique intertendinous connection
The tendons on the 2-5 extensor tendons form extensor expansions where
On the distal metacarpals
What joins the extensor expansion
The four tendons of the extensor digitorum join the fascial expansion
Near the PIP, what happens to the extensor expansion
Splits into three parts
What are the three parts of the extensor expansion
Central part and two lateral parts
The central part of the extensor expansion inserts where
Into the base of the middle phalanx
The two lateral parts of the extensor expansion converge to be inserted where
Into the base of the distal phalanx
The tendon on the index finger is joined by what and where
Medial side by tendon of the extensor indicis
Tendon to little fingers joined where and by what
Medial side by the two tendons of the extensor digiti minimi
What forms the lateral boundary of the snuff box
Extensor pollicis brevis and the abductor pollicis longus
What forms the medial boundary of the snuff box
Extensor pollicis longus
The proximal border of snuff box formed by
Styloid process of radius
Distal border of snuff box formed by
Approximate apex of the snuffbox isosceles triangle
What can be palpated on the floor of the snuff box
Trapezium and scaphoid
What vessels are present in the snuff box
Radial artery and nerve, cephalic vein
What muscles supinators regardless of flexion/extension position (versus biceps brachii)
Supinator
What is the strongest supinator
Biceps
Is supination or pronation more powerful
Supination
