Flashcards in Hand Deck (66):
Name the (2) types of prehension.
Manipulative and Non-manipulative prehension
Which type of prehension is more concerned with fine motor skills?
Manipulative prehension - tip-to-tip grip, lateral pinch or palmar pinch
The carpal bones articulate with which bones?
The radius and then the metacarpals distal to them
How many phalanges in total?
Describe a boxer's fracture?
Fracture of the 5th metacarpal
What types of articulations occur at Carpometacarpal joints (CMC)?
Digits 2-5: Gliding
What articulations occur at MCP/MP joints?
Digits 2-5: Condyloid
The DIP, PIP and IP joint of the thumb are all?
Flexion/Extension of Digits 2-5 can occur at which all joints?
DIP, PIP and MCP/MP
ABduction/ADduction of digits 2-5 occur at which joints of the hand?
MCP/MP joints of hand
ABduction/ADduction of the thumb occurs at which joint?
Flexion/Extension of thumb occurs at which joint?
CMC, MCP and IP joints
Opposition of thumb occurs at which joints?
What do the collateral ligaments guard against>
Excessive lateral deviation of the MCP and IP joints
What do the volar (palmar) ligaments (plates) guard against?
Hyperextension of the joint and aids in centering the long flexor tendons
Where do extrinsic hand muscles have their proximal attachments?
Outside of the hand out in the forearm
Which type of prehension are extrinsic hand muscle responsible for?
Intrinsic hand muscles begin and end where?
Proximal attachment of FDS?
Medial epicondyle of humerus (like other wrist flexors)
Distal attachment of FDS?
Base of middle phalanx of digits 2-5
Action of FDS?
Flexion of digits 2-5 at the PIP joint
Innervation of FDS?
Proximal attachments of FDP?
Proximal ulna and Interosseous Membrane
Distal attachments of FDP?
Base of distal phalanx of digits 2-5
Action of FDP?
Flexion of digits 2-5 at the DIP joints
Innervation(s) of FDP?
Medial 1/2 - ulnar n.
Lateral 1/2 - Anterior interosseous nerve
Proximal attachment of ED?
Lateral epicondyle of humerus
Distal attachment of ED?
Action of ED?
Extension of digits 2-5
at MCP (also IP)
Innervation of ED?
Posterior interosseous nerve (branch of Radial nerve)
Name (2) other extrinsic digit extensors in addition to ED?
Extensor indicis proprius
Extensor digiti minimi
Innervations of EIP and EDM?
Posterior interosseous nerve
What structure couples the actions of digits 2-5?
Juncturae Tendinum - lateral connections between ED tendons
Which structure is responsible for ED's actions on IP joints?
The extensor expansion
Proximal attachment of FPL?
Distal attachment of FPL?
Distal phalanx of thumb
Action of FPL?
Flexes IP of thumb
Innervation of FPL?
Anterior interosseous nerve
Proximal attachment of EPL?
Post. distal ulna
Distal attachment of EPL?
base of distal phalanx of thumb
Action of EPL?
Extends the IP of thumb
Innervation of EPL?
Posterior interosseous nerve
Attachments of EPB?
Post. distal radius --> base of proximal phalanx of thumb
Actions of EPB?
Extends CMC and MCP joints
Innervation of EPB?
Posterior interosseous nerve.
Action of ABductor Pollicis Longus?
Abducts thumb at CMC joint
Innervation of ABductor Pollicis Longus?
Posterior Interosseous Nerve
De Quervain's Tenosynovitis
Inflammation of EPB and APL tendons as they glide over radial styloid process
Describe Finklestein's Test?
Hold thumb and perform ulnar deviation of wrist: if pain present then positive for De Quervain's Tenosynovitis
Name the muscles included in the thenar musculature?
Flexor Pollicis Brevis
Abductor Pollicis Brevis
Innervation of Opponens pollicis?
Recurrent branch of median nerve
Innervation of Flexor pollicis brevis?
Recurrent branch of median and ulnar.
Innervation of Abductor pollicis brevis?
Recurrent branch of median n.
Name the muscles included in the hypothenar musculature?
Abductor digiti minimi
Flexor digiti minimi brevis
Opponens digiti minimi
Carpal tunnel syndrome is identifiable because?
Thenar wasting and parasthesias
Adductor pollicis action?
Adducts thumb at CMC joint
Adductor pollicis innervation?
Lumbricals are special because?
Only muscle to not have any bony attachments
FDP tendons -> Extensor hood
Action of lumbricals?
Flex at MP joint but extend DIP/PIP joints
Innervation of Lumbricals?
Lumbricals 1/2 - median
Lumbricals 3/4 - Ulnar N.
DAB - do ABduction and Ulnar N. innervation
PAD - do ADduction and Ulnar N. innervation
Swan Neck Deformity
Volar plates are lax so the PIP joints hyperextend and DIP joints flex
PIP joint protrudes through central tendon; PIP flexion with DIP extension
inability to extend the DIP