MSK Flashcards
What is the most commonly dislocated carpal bone; which nerve most likely to be affected?
Lunate; may compress median n.
Which protein mediates Ca2+ activation of the contractile apparatus in cardiac and skeletal muscle?
Troponin (Tn)
Why is cartilage, such as the hyaline cartilage in the knee joint particularly vulnerable to infection?
Cartilage is relatively avascular; immune system cannot access in an efficient fashion
Most of the blood supply to the head of the femur arise from which artery?
Medial Circumflex Femoral a.
Rheumatoid nodules will show what histologically?
Central areas of fibrinoid necrosis surrounded by palisading rim of epitheliod cells –> resembles granuloma
Which virus has been implicated as a cause of Paget disease of bone?
Paramyxovirus (measeles and RSV) in osteoclasts of bone
Axillary nerve runs closest to the humerus at which location?
Surgical neck
Quadrangular space is formed by which structures?
- Teres minor
- Teres major
- Long head of triceps
- Surgical neck of humerus
Which artery accompanies the axillary nerve in close proximity to the surgical neck of the humerus?
Posterior humeral circumflex a. (branch of axillary a.)
Which nerve and roots innervate the serratus anterior m.?
Long thoracic n. (C5-C7)
Which bands of skeletal muscle are delineated by the sarcomere, actin thin filaments and myosin thick filaments; how do they change during contraction?
- I-band contains a Z-disk, delineating a sarcomere and actin thin filaments; during contraction the I-band shortens
- A-band, delineated by ends of myosin thick filaments; does not change during contraction
Which muscle is responsible for protrusion of the tongue and its innervation?
Genioglossus m. (CN XII)
What is the only muscle of the tongue innervated by CN X and its function?
Palatoglossus ms. = pull tongue upward toward the palate
Which 2 muscles of the hand have their origins on the hook of the hamate?
Flexor digiti minimi and opponens digiti minimi
A sample of urine that turns black upon standing at room temperature is classically associated with what condition?
Onchronosis aka Alkaptonuria