Anatomic spaces

Question 1

Guyon’s canal

Answer 1

1. 4 cm long 2. Ulnar n. compression Zone 1- sensory and motor Zone 2- Motor only (runs deep to hook of hamate); Deep motor innervates all interossei, 3rd/4th lumbricals, hypothenar, adductor pol, deep head of FPB Zone 3- Sensory only

Question 2

Guyon’s borders

Answer 2

Roof- Palmar carpal lig Floor- Transverse carpal lig Radial- Hook of hamate Ulnar- Pisiform/ Pisohamate lig

Question 3

Shoulder spaces- Quadrilateral space

Answer 3

Borders: Sup- T. minor; Inf.- T. maj; Lateral- humerus; medial- Triceps (long) Contains: ax n. and post hum circumflex At risk during post approach to shoulder if dissecting below T. min

Question 4

Shoulder spaces- Triangular Space (S for superior)

Answer 4

Borders: Sup- T. min; inf- T. maj; lat- Triceps Contains: Circumflex scapular a.

Question 5

Shoulder spaces- Triangular Interval (I for inferior)

Answer 5

Borders: Sup- T. maj; medial- Triceps; lat- humerus Contains: Radial n. and profunda brachii

Question 6

Structures passing thru gt. sciatic notch

Answer 6

(structures below piriformis=POPS IQ) 1. Piriformis 2. Internal Pudendal n. 3. N. to obturator internus 4. Posterior femoral cutaneous n. 5. Sciatic n. 6. Inf gluteal a/ n 7. N. to quadratus

Question 7

Structures passing thru lesser sciatic notch

Answer 7

1. Tendon of obturator internus 2. Nerve to obturator internus 3. Pudendal nerve 4. Internal pudendal artery

Question 8

Anterior neck triangle borders

Answer 8

SCM, midline of neck, lower border of mandible

Question 9

posterior tarsal tunnel

Answer 9

Medial- laciniate ligament (flexor retinaculum)

Lateral- Talus, calcaneus and sustentaculum tali

Inferior- Abductor hallucis