integumentary and nervous Flashcards
What are the three layers of the skin?
epidermis, dermis, hypodermis
epidermis
stratified squamous epithelium
keratinized
avascular
dermis
deeper connective tissue layer
made of collagen
houses hair follicles and nail roots
hypodermis
adipose tissue
energy reservoir
thicker in women
thick skin
Covers the palms of the hands and soles of the feet
Has five layers of keratinocytes
only has sweat glands
thin skin
covers rest of the body
possesses hair follicles, sebaceous glands and sweat glands
free edge
overhangs the fingertip
nail body
visible part of the nail
nail root
extends proximally under overlying skin
apocrine glands
- attached to hair follicles
- inactive until puberty
- located in armpaits
eccrine glands
on hairless areas of the body
sebum
the oily secretion of the sebaceous glands
basal cell carcinoma
most common, least dangerous, forms from cells in stratum basal
squamous cell carcinoma
affects squamous cells, can metastasize
malignant melanoma
from melanocytes, less than 5% of skin cancers, fatal if metastasizes
central nervous system
brain and spinal cord
peripheral nervous system
connects all nerves to CNS
-has two parts: somatic and autonomic
afferent fibers
deliver messages to the CNS
efferent fibers
carry out impulses to the organs
somatic nervous system
voluntary movement
autonomic nervous
involuntary movement
-has two parts: sympathetic and parasympathetic
sympathetic nervous
fight or flight
parasympathetic
constant resting actions
hypothalamus
related to autonomic nervous, works w/ thalamus in response to pain, hunger, and other hormones
amygdala
aggression center, feelings of anger, violence, and anxiety are produced here
hippocampus
converts short-term memory to long-term memory
cell body
host to nucleus
dendrites
receive signals
axons
covered in myelin sheath, electrical impulses travel through here
