ANAT Compartments of the Arm Flashcards
Muscles in the anterior compartment - flexors/extensors
Flexors
Muscles in the posterior compartment - flexors/extensors
Extensors
How do compartments of the arm contribute to compartment syndrome?
An increase in fluid in compartment, increases pressure to block circulation/supply to muscle to cause muscular damage/atrophy or compress neural tissue to cause nerve damage.
(E.g., fracture, bleed).
Isotonic muscle contraction.
Constant tension w load moves as length of muscle changes.
Classifications of isotonic muscle contraction.
Eccentric - muscle lengthens under tension when lowering load
Concentric - muscle shortens under tension when moving load (eg., lifting hand weight)
Isometric muscle contraction
Constant length
Hilton’s law
A nerve that supplies a muscle producing movement at a joint also supplies the joint and the skin overlying the insertion of the muscle.
Forearm flexors innervation
MC nerve
Biceps bracci function
Flexion & supination of forearm
Coracobrachialis function
Flexion & adduction at shoulder joint
Forearm extensors innervation
Radial nerve
Lateral epicondyle is the origin of many muscles responsible for extension/flexion
Extension
Medial epicondyle is the origin of many muscles responsible for extension/flexion
Flexion
Triceps function
Extension of forearm/elbow joint
What type of distal humerus fracture is most common in the paed population?
Supacondylar fracture
