PAS 407 Antebrachium UPDATED ACTUAL Questions and CORRECT Answers
aka the forearm
Antebrachium
extends from elbow to wrist
radial and ulnar
what two bones consist in the antebrachium and what are antebrachium consists of 2 bones joined by interosseus
they joined by? membrane
- loose arrangement permits pronation/supination of the
forearm (effectively "rotation" of wrist)
arrangment divides forearm
anteriorly/posteriorly
- muscular compartments acting upon wrist/digits
- muscle bellies located in proximal forearm with long
what is the arrangement of antebrachium?
tendons extending to hand
- for many muscles, proximal atttachment point extends
past elbow joint
- decreases bulk of distal forearm/hand to maximize
- can head to clinical problems (e.g. tendinitis)
lies on the medial aspect of the forearm
much larger proximally, tapering at the wrist
trochlaer notch - deep concave surface for articulation with
trochlea of humerus at elbow
- olecranon process projects posteriorly
ulna
- coronion process projects anteriorly
radial notch lies inferior to trochlear notch for articulation
with head of radius
shaft terminates in ulnar head for articulation at wrist joint
- styloid process increases concavity of wrist joint
,trochlear notch
radial notch
note: styloid process is on the ulnar head
styloid process
lies on the lateral aspect of the forearm
much larger distally, making up most of the proximal sur-
face of the wrist joint
radius
smooth round radial head articulates with ulna in the
radial notch
, distal dorsal (posterior) surface has numerous grooves
which accommodate tendons of the posterior compart-
ment of the antebrachium
styloid process increases concavity, surface area contact of
wrist joint
(synovial pivot type joints)
articulation of cylindrical head of radius with radial notch
on ulna
proximal radioulnar joints
permit rotation of bones relative to one another during
pronation/supination
joint capsule/synovial membrane that project inferiorly
into proximal sacciform recess
what is the radioulnar joint surrounded by? - laxity accommodates twisting of capsule during rotation
- synovial membrane continuous with synovial membrane
of elbow joint
thin extension of the articular capsule of the proximal
radioulnar joint, under the anular ligament of radius.
proximal sacciform recess
intracapsular annular ligament
what ligament is radioulnar reinforced by?
- attaches to ulna anterior/posterior to radial notch
- secures joint while permitting rotation of radial head
aka the forearm
Antebrachium
extends from elbow to wrist
radial and ulnar
what two bones consist in the antebrachium and what are antebrachium consists of 2 bones joined by interosseus
they joined by? membrane
- loose arrangement permits pronation/supination of the
forearm (effectively "rotation" of wrist)
arrangment divides forearm
anteriorly/posteriorly
- muscular compartments acting upon wrist/digits
- muscle bellies located in proximal forearm with long
what is the arrangement of antebrachium?
tendons extending to hand
- for many muscles, proximal atttachment point extends
past elbow joint
- decreases bulk of distal forearm/hand to maximize
- can head to clinical problems (e.g. tendinitis)
lies on the medial aspect of the forearm
much larger proximally, tapering at the wrist
trochlaer notch - deep concave surface for articulation with
trochlea of humerus at elbow
- olecranon process projects posteriorly
ulna
- coronion process projects anteriorly
radial notch lies inferior to trochlear notch for articulation
with head of radius
shaft terminates in ulnar head for articulation at wrist joint
- styloid process increases concavity of wrist joint
,trochlear notch
radial notch
note: styloid process is on the ulnar head
styloid process
lies on the lateral aspect of the forearm
much larger distally, making up most of the proximal sur-
face of the wrist joint
radius
smooth round radial head articulates with ulna in the
radial notch
, distal dorsal (posterior) surface has numerous grooves
which accommodate tendons of the posterior compart-
ment of the antebrachium
styloid process increases concavity, surface area contact of
wrist joint
(synovial pivot type joints)
articulation of cylindrical head of radius with radial notch
on ulna
proximal radioulnar joints
permit rotation of bones relative to one another during
pronation/supination
joint capsule/synovial membrane that project inferiorly
into proximal sacciform recess
what is the radioulnar joint surrounded by? - laxity accommodates twisting of capsule during rotation
- synovial membrane continuous with synovial membrane
of elbow joint
thin extension of the articular capsule of the proximal
radioulnar joint, under the anular ligament of radius.
proximal sacciform recess
intracapsular annular ligament
what ligament is radioulnar reinforced by?
- attaches to ulna anterior/posterior to radial notch
- secures joint while permitting rotation of radial head
