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Chapter 13 Part 1
Unencapsulated and Encapsulated
9
Anatomy
Undergraduate 2
04/29/2009

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Term
Free Nerve endings of sensory neurons
Definition

Unencapsulated

L: exteroceptors, interoceptors, and proprioceptors


S: thermoreceptors (warm and cool), chemoreceptors (itch, pH..)


Body L: most body tissues; most dense in connective tissues (ligaments, tendons, joint capsules) and epithelia (epidermis)

Term
Modified free nerve endings: Merkel disc (tactile discs)
Definition

Unencapsulated

L: Exteroceptors


S: Mechanoreceptors (light pressure); slowly adapting


Body Location: basal layer of epidermis of skin

Term
Hair follicle receptors
Definition

Unencapsulated

L: Exterocrptors


S: Mechanoreceptors (hair deflection); rapidly adapting


Body Location: in and surrounding hair follicles

Term
Meissner's corpuscles (tactile corpuscles)
Definition

Encapsulated

L: Exteroceptors


S: Mechanoreceptors (light pressure, discriminative touch, vibration of low frequency); rapidly adapting


Body Location: Dermal papillae of hairless skin, particularly nipples, external genitalia, fingertips, soles of feet, eyelids

Term
Pacinian corpuscles (lamallated corpuscles)
Definition

Encapsulated

L:Exteroceptors, interoceptors, and some proprioceptors


S: Mechanoreceptors (deep pressure, stretch, vibration of high frequency); rapidly adapting

Body Location: dermis and hypodermis; periostea, mesentery, tendons, ligaments, joint capsules; most abundant on fingers, soles of feet, external genitalia, nipples

Term
Ruffine endings
Definition

Encapsulated

L:Exteroceptors and proprioceptors


S:Mechanoreceptors (deep pressure and stretch); slowly adapting


Body Location: Deep in dermis, hypodermis, and joint capsules

Term
Muscle spindles
Definition

Encapsulated

L:Proprioceptors


S:Mechanoreceptors(muscle stretch, length)


Body Location: Skeletal muscles, particularly those of the extremities

Term
Golgi tendon organs
Definition

Encapsulated

L:Proprioceptrs


S: Mechanoreceptors (tendon stretch, tension)


Body Location: Tendons

Term
Joint Kinesthetic receptors
Definition

Encapsulated

L: Proprioceptors


S:Mechanoreceptors and nocioceptors

Body Location: Joint capsules of synovial joints

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