Nervous System Flashcards
(39 cards)
Where do afferent neurons come from and where do they go?
From organs or tissue to the CNS
Where do efferent neurons come from and where do they go?
From the CNS to organs or tissue
What is a synapse?
Site of chemical communication between 2 or more neurons
How do signals travel through nerves?
Action potentials become chemical signals (neurotransmitters) and travel through nerve axons, becoming electrical signals again at the brain.
What is the somatic nervous system?
Part of peripheral nervous system- associated with skeletal muscle voluntary control of body
What is the autonomic nervous system?
Part of peripheral nervous system- associated with smooth muscle (involuntary)- e.g. internal organs
What is the outermost layer of the brain called?
Cerebral cortex (grey matter)
Name 2 features of the cerebral cortex
Gyrus and Sulcus (types of folds)
How many cranial fossa are there in the base of the skull?
3 (anterior, middle and posterior cranial fossa)
What is the name of the hole is the base of the skull which the spinal cord passes through?
Foramen Magnum
Name the 3 parts of the brainstem, from superior to inferior
Midbrain, Pons and Medulla Oblongata
Name the two enlargements on the spinal cord
cervical enlargement and lumbosacral enlargement
What is the inner area of the brain (containing many axons) also known as?
White matter- due to myelin
In which part of the grey matter are the sensory cell bodies?
Dorsal horn
In which part of the grey matter are the motor cell bodies?
Ventral horn
How many spinal nerves are there in total and how many of each kind?
31 altogether: 12 thoracic 5 lumbar 5 sacral 1 coccygeal
Which dermatome supplies the umbilicus?
T10
Which dermatome supplied the male nipple?
T4
What is a nerve plexus?
Networks of intertwined anterior rami
Which nerves form the cervical plexus?
C1-4 anterior rami
Which nerves form the brachial plexus?
C5-T1 anterior rami
Which nerves form the lumbar plexus?
L1-L4 anterior rami
Which nerves form the sacral plexus?
L5-S4 anterior ramI
Where do sympathetic fibres travel to in the spinal cord?
lateral horn (only present in T1-L2)
