Anatomy

Question 1

Slow ATPase activity
Large oxidative capacity - with large numbers of mitochondrial
Red color, small diameter

Answer 1

Type 1 Muscle Fibers

Question 2

Fast oxidative glycolytic fibers
Fast ATPase activity
High glycolytic capacity
Moderate oxidative capacity
Fast fibers, resistant to fatigue
Red in color, large in diameter

Answer 2

Type IIa Fibers

Question 3

Fast oxidative glycolytic fibers
Fast ATPase activity
High glycolytic capacity
Low oxidative capacity
Fast fibers, fatigable
Pale color, Large diameter

Answer 3

Type IIb Fibers

Question 4

Pain from the buttock down posterior thigh
Weakness in plantarflexion + toe flexion
Ankle reflex reduced/absent

Answer 4

S1 Radiculopathy

Question 5

Proximal weakness
Atrophy of Type II Fibers

Answer 5

Steroid-induced Myopathy

Question 6

Hypotonia + Weakness at birth/early childhood
Oculomotor Deficits: Ptosis, Ocular Palsies
Weakness of facial, pharyngeal, laryngeal neck muscles
Respiratory failure can occur in the first few months of life

Needle EMG: Myopathic pattern with positive waves and fibrilations
Path:

Answer 6

Centronuclear Myopathy