midterm Flashcards
sagittal plane
left and right hemispheres (parallel to ground)
frontal plane
dorsal and ventral sections
transverse plane
perpendicular to long axis and divides into cranial and caudal
diastema
space between canines and premolars
three components of connective tissue
fibers
ground substance
cells
what are the three types of fiber?
collagenous, elastic, reticular
describe collagenous fiber
most abundant
consists of protein collagen (tendons, ligaments, skin, cartilage, bone)
helps tissue bind
describe elastic fiber
consists of elastin (extracellular matrix
facilitates recoiling in structures like arteries and lungs
describe reticular fiber
contains protein reticulum
provides scaffolding for other cells in structures such as liver and lymphoid organs
what is ground substance and give an example
consists of formless matrix and has large carbohydrates and complexes containing protein and carbohydrates
ex. glycosaminoglycans
name the two types of cells in terms of connective tissue and provide and example
- stationary
ex. fibroblasts and adipocytes - migrating
ex. mast cells, macrophages, monocytes, lymphocytes
describe loose connective tissue and provide examples
most common
supports organs and serves to provide attachment for epithelial tissue to other underlying tissue
ex. arelor and fascia
describe dense connective tissue and provide an example
bundles of collagen and fibroblasts
substance divides into dense regular and dense irregular
ex. tendons and ligaments
list examples of specialized connective tissue
bone, blood, cartilage
what are other three support tissue that are not connective tissue?
epithelial
nervous
muscle tissue
what do arteries do
- carry blood from heart to other organs and tissue
- are elastic in nature, relax and contract in rhythm with heart and maintain blood pressure
what are veins
carry blood to the heart
same three layers as arteries but thinner
capacity to dilate to accommodate an increase in blood volume
what are capillaries?
act as bridge between arteries and vein
thin walls allow for nutrients like oxygen to pass from blood to tissue as well as substances from tissue back into circulation
describe the pathway of blood from the heart back to the heart
Heart -> Arteries -> Arterioles -> Capillaries -> Venules -> Veins -> Heart
Neuronal aggregations (aggregations of cell bodies) in the brain are referred to
as
nuclei
aggregations of cell bodies in the peripheral nerves are
referred to as
ganglia
astrocytes
Assist with blood-brain barrier maintenance, metabolism, ion regulation, and injury repair
oligodendrocytes
Produces myelin sheath in the CNS
microglia
Very important immune function in the CNS
true or false: The diencephalon consists of the hypothalamus, thalamus, and epithalamus
true
where are sensory neurons (cell bodies) for the spinal cord located?
dorsal root ganglion
Which nerves are responsible for olfaction, vision, and hearing
respectively?
olfactory (I)
optic (II)
vestibulocochlear (VIII)
trigeminal nerve (CN V)
- largest sensory nerve among the cranial nerves
- provides motor innervation to muscles of mandibular origin
- 3 divisions: Ophthalmic, Maxillary, Mandibular
- mandibular nerve exits through the oval foramen of the skull
- ophthalmic and maxillary divisions exit through the orbital fissure and round foramen of the skull
facial nerve (CN VII)
- originates from the brain stem and exits the skull through the stylomastoid foramen
- parasympathetic component
- somatic component of this nerve provides innervation to muscles of facial expression
vagus nerve (CN X)
- contains visceral afferent, parasympathetic and somatic efferent (motor) fibers
- provides parasympathetic innervation to visceral organs in the thoracic and abdominal area
- Most of the fibers in vagus provide afferent information from the viscera to the brain
- small motor component is responsible for providing innervation to the laryngeal muscles
describe the somatic NS
- Nerves go to skeletal muscle
- Regulate both voluntary and involuntary (reflex) functions
- Has only one neuron between CNS and target tissue
- Exclusively causes excitation of the target tissue
describe visceral NS
- Causes either excitation OR inhibition of the target tissue
- Nerves go to visceral muscle (smooth and cardiac) and glandular epithelium
- Regulates only involuntary (reflex) functions
- Has two neurons between CNS and target tissue
describe the parasympathetic system
- Has long preganglionic fibers
- Has short postganglionic fibers
- Originates from the brain and sacral segments of spinal cord
- Lowers heart rate, promotes digestion, and promotes urination
describe the sympathetic system
- Has long postganglionic fibers
- Has short preganglionic fibers
- Originates from thoracolumbar segments of spinal cord
- Increases heart rate, inhibits digestion, inhibits urination
which cranial nerves have parasympathetic components?
CN III, VII, IX, and X