11.4 & 11.5: Peripheral Nervous System and Senses

Somatic System Nerves

Cervical, throaic, lumbar, sacral, coccygeal

Cervical Nerves

serve head, neck and arms

Thoraic Nerves

servse chest and abdomen

Lumbar Nerves

serve legs

Sacral Nerves

serves bowel and bladder

Coccygeal Nerves

serve rectum and anus

Pain

interpration by the brain of sensory input received by specialized cells

What cells rescive pain signals?

Substantia gelatinosa (SG)

Pain occurs when

SG cells are stimulated by an Afferent nerve and it then produces a neurotransmitter that communicates with the injured organ tissue and relays message to the brain

Neurotrasnmitters

produces by pituitary gland and hypothalamus during pain, excitement etc and they attach to SG cell receptors to prevent communicated wit damageo organ and prevent pain

Mechanoreceptors

Detect touch, pressure, vibration, and sound.

Photoreceptors

Detect light and allow vision.

Chemoreceptors

Detect chemicals involved in taste and smell.

Thermoreceptors

Detect changes in temperature.

Nociceptors

Detect pain from potentially harmful stimuli