Flashcards in Unit 1: Lecture 15 Deck (42):
The motions of pronation/supination are augmented by what motions AT the wrist?
- ulnar/radial deviation
Name the carpal bones
Which carpal bone is most often broken?
Which carpal bone is most often dislocated?
Where does the triangular fibrocartilage covering the distal radioulnar joint originate?
Styloid process of ulna
What type of joint is the radiocarpal?
On either side of the hand (radial and ulnar), what are the two ligaments connecting to the carpals?
Ulnar and radial collateral ligaments
What type of joints are the intercarpals?
Which joint capsule encloses an articular disk?
Distal Radioulnar joint
What motion do the radio/ulnar collateral ligaments limit?
Joints of the of the proximal carpal row
Joints between scaphoid, lunate, triquetrum, and pisiform
Joints of the of the distal carpal row
Joints between capitate, hamate, trapezoid, and trapezium
Joints between proximal and distal rows
What's to note about the pisiform?
- Forms the attachment of the flexor and extensor retinaculum on the ulnar side of the wrist
- The ulnar nerve passes between it and the hamate as it enters the palm, creating the Guyon's Canal
What is the second most broken carpal bone?
What is the third most broken carpal bone?
What kind of joints are the carpometacarpals (2-5)?
What kind of joint is the carpometacarpal of the thumb?
What kind of joints are the metacarpal joints (2-5)?
What kind of joint is the MCP of the thumb?
Deep transverse metacarpal ligament
Thick ligamentous band interconnecting the 2nd - 5th MCP joints
Keeps them from "overspreading"
Palmar ligament (plate)
The palmar/volar portion of the joint capsule, thickened with fibrocartilage
- encase MCP, PIP, and DIPs
- tight during flexion; loose in extension to allow for ABduction/ADduction
Triangular expansion of the palmar fascia covering the carpal tunnel and extending to the MCP joints
Thenar/Hypothenar Muscle Sheathes
Covers thenar/hypothenar muscles
- covers carpal tunnels
- connects thenar and hypothenar eminences
- originates from trapezium and inserts on hook of hamate
Intrinsic muscles of the hand
- Thenar muscles
- Hypothenar muscles
- Middle compartment muscles
Originate at flexor retinaculum or pisiform bone, act of 5th digit, and innervated by deep branch of ulnar nerve
- Abductor Digiti Minimi
- Flexor Digiti Minimi
- Opponens Digiti Minimi
Originate at carpal bone, flexor retinaculum, or the metacarpal bones -- act on the thumb -- and most are innervated by recurrent branch of median nerve
- Abductor pollicis brevis
- Flexor pollicis brevis
- Opponens pollicis
- Adductor pollicis (deep branch of ULNAR n.)
Middle compartment muscles of hand
Originate between 2-5 metacarpals and act on the same digits
- Interossii muscles (4 dorsal, 4 palmar - all deep branch of ULNAR n.)
- Lateral 2 lumbricals (median n.)
- Medial 2 lumbricals (deep branch of ulnar n.)
Ulnar artery crosses wrist...
Ulnar artery travels with...
DEEP to palmar aponeurosis, but SUPERFICIAL to flexor retinaculum
What is the primary blood supply to the hand?
Princeps pollicis artery (thumb) and radialis indicis artery (index finger) arise from what artery?
From where does the recurrent radial artery first arise?
Superior margin of the supinator muscle
Canal of Frohse
The canal the deep radial nerve passes through before it enters forearm
What passes THROUGH carpal tunnel?
- Median nerve
- Flexor Digitorum superficialis tendons (all 4)
- Flexor Digitorum profundus tendons (all 4)
- Flexor Pollicuc Longus tendon
Extensor Retinaculum: Compartment 1 structures
Abductor pollicis longus
Extensor pollicis brevis
Extensor Retinaculum: Compartment 2 structures
Extensor carpi radialis brevis
Extensor carpi radialis longus
Extensor Retinaculum: Compartment 3 structures
Extensor pollicis longus
Extensor Retinaculum: Compartment 4 structures
Extensor digitorum (pre-split)
Extensor Retinaculum: Compartment 5 structures
Extensor digiti minimi