Week 1: Somatosensory- Musculoskeletal Receptors

Question 1

Muscle spindle

Answer 1

• Sensory organ in muscle composed of muscle fibers, sensory endings, and motor endings
• Respond to stretch of muscle

Question 2

Extrafusal fibers

Answer 2

Skeletal muscle fibers outside the spindle

Question 3

Intrafusal

Answer 3

Fibers inside the spindle

Question 4

Type Ia afferents

Answer 4

Register quick tonic stretch of muscle spindle

Question 5

Type II afferents

Answer 5

Monitor tonic stretch

Question 6

Golgi tendon organs

Answer 6

• Relay tension in tendons
• Type Ib afferents woven into collagen
• Sensitive to small changes
• Active and passive stretch

Question 7

Joint receptors

Answer 7

Respond to deformation of joint capsule and ligaments

Question 8

Paciniform corpuscles

Answer 8

• Respond to movement

- Type II afferents

Question 9

Ruffini’s endings

Answer 9

• Extremes of joint range
• Respond more to passive movement
• Type II afferents

Question 10

Ligament receptors

Answer 10

• Signal tension

- Type Ib afferents

Question 11

Free nerve endings

Answer 11

• Stimulated by inflammation

- Type III (A-delta) and Type IV (C)