BIOS 255 TEST 3 ACTUAL FINAL
EXAM 2026 WITH REAL
QUESTIONS AND ANSWERS //
GRADED A+ // LATEST 2026
//GUARANTEED PASS // BIOS 255
The nerves emerging from a sacral plexus innervate the region, pelvis,
perineum, posterior thigh, and almost all of the . - ANSWER-gluteal, leg
and foot
The sciatic nerve is actually composed of two divisions wrapped in a common
sheath. What are the two divisions? - ANSWER-Tibial and common fibular
A reflex arc is the neural wiring of a reflex. - ANSWER-single
The lumbar plexus is subdivided into a(n) division and a division. -
ANSWER-anterior, posterior
The left and right sacral plexuses are formed from the rami of spinal
nerves and are located immediately inferior to the lumbar plexuses. -
ANSWER-anterior, L4-S4
Choose the two primary functions of the nervous system. - ANSWER-
interpretation control
,The anterior funiculus is composed of tracts of white matter that occupy the space
on each side of the cord between the anterior gray horns and the anterior
. - ANSWER-anterior, anterior median fissure
Some of the individual tracts conduct sensory impulses as from the spinal
cord to the brain. - ANSWER-ascending tracts
The white matter of the spinal cord is to the gray matter. - ANSWER-
external
The horns primarily house the cell bodies of somatic motor neurons. -
ANSWER-anterior
The cell bodies of neurons are found in the posterior horns of the spinal
cord. - ANSWER-sensory
The anterior funiculi are interconnected by the . - ANSWER-white
commissure
The axons within each white matter funiculus are organized into smaller structural
units called . - ANSWER-tracts
Each anterior root and its corresponding posterior root unite within the to
become a spinal nerve. - ANSWER-intervertebral foramen
Dermatomes are clinically important because they can indicate potential damage to
one or more . - ANSWER-spinal nerves
The principal plexuses are the plexus, plexus, plexus, and sacral plexuses -
ANSWER-cervical or Cervical
Blank 2: brachial or Brachial
,Blank 3: lumbar or Lumbar
One important branch of the cervical plexus is the phrenic nerve, which is formed
primarily from the nerve and some contributing axons from .-
ANSWER-C4, C3 and C5
The cell bodies of neurons are found in the posterior horns of the spinal
cord. - ANSWER-sensory
There are five roots of anterior rami that unite to form the superior, middle, and
inferior in the posterior triangle of the neck. - ANSWER-trunks
, A spinal nerve contains axons. - ANSWER-motor and sensory
The rami of most spinal nerves form nerve plexuses on the right or left side
of the body. - ANSWER-anterior
The phrenic nerve travels through the thoracic cavity to innervate the .-
ANSWER-diaphragm
Each brachial plexus is formed by the anterior rami of spinal nerves .-
ANSWER-C5-T1
The left and right lumbar plexuses are formed from the rami of spinal
nerves L1-L4 located lateral to the L1-L4 vertebrae and along the muscle
in the posterior abdominal wall. - ANSWER-anterior, psoas major
EXAM 2026 WITH REAL
QUESTIONS AND ANSWERS //
GRADED A+ // LATEST 2026
//GUARANTEED PASS // BIOS 255
The nerves emerging from a sacral plexus innervate the region, pelvis,
perineum, posterior thigh, and almost all of the . - ANSWER-gluteal, leg
and foot
The sciatic nerve is actually composed of two divisions wrapped in a common
sheath. What are the two divisions? - ANSWER-Tibial and common fibular
A reflex arc is the neural wiring of a reflex. - ANSWER-single
The lumbar plexus is subdivided into a(n) division and a division. -
ANSWER-anterior, posterior
The left and right sacral plexuses are formed from the rami of spinal
nerves and are located immediately inferior to the lumbar plexuses. -
ANSWER-anterior, L4-S4
Choose the two primary functions of the nervous system. - ANSWER-
interpretation control
,The anterior funiculus is composed of tracts of white matter that occupy the space
on each side of the cord between the anterior gray horns and the anterior
. - ANSWER-anterior, anterior median fissure
Some of the individual tracts conduct sensory impulses as from the spinal
cord to the brain. - ANSWER-ascending tracts
The white matter of the spinal cord is to the gray matter. - ANSWER-
external
The horns primarily house the cell bodies of somatic motor neurons. -
ANSWER-anterior
The cell bodies of neurons are found in the posterior horns of the spinal
cord. - ANSWER-sensory
The anterior funiculi are interconnected by the . - ANSWER-white
commissure
The axons within each white matter funiculus are organized into smaller structural
units called . - ANSWER-tracts
Each anterior root and its corresponding posterior root unite within the to
become a spinal nerve. - ANSWER-intervertebral foramen
Dermatomes are clinically important because they can indicate potential damage to
one or more . - ANSWER-spinal nerves
The principal plexuses are the plexus, plexus, plexus, and sacral plexuses -
ANSWER-cervical or Cervical
Blank 2: brachial or Brachial
,Blank 3: lumbar or Lumbar
One important branch of the cervical plexus is the phrenic nerve, which is formed
primarily from the nerve and some contributing axons from .-
ANSWER-C4, C3 and C5
The cell bodies of neurons are found in the posterior horns of the spinal
cord. - ANSWER-sensory
There are five roots of anterior rami that unite to form the superior, middle, and
inferior in the posterior triangle of the neck. - ANSWER-trunks
, A spinal nerve contains axons. - ANSWER-motor and sensory
The rami of most spinal nerves form nerve plexuses on the right or left side
of the body. - ANSWER-anterior
The phrenic nerve travels through the thoracic cavity to innervate the .-
ANSWER-diaphragm
Each brachial plexus is formed by the anterior rami of spinal nerves .-
ANSWER-C5-T1
The left and right lumbar plexuses are formed from the rami of spinal
nerves L1-L4 located lateral to the L1-L4 vertebrae and along the muscle
in the posterior abdominal wall. - ANSWER-anterior, psoas major
