Anatomy studies

In this unit I would expect you to be able to follow a
general sensory & motor tracing.

The sections in bold
will be the same for all the tracing
The sections in italics are
those that will change depending on the circumstance of the tracing. Practice with the 5 scenarios give, you can
also make up scenarios for your study group to practice on! The first thing you will want to do is figure
out if it is a motor or a sensory tracing.

Make up of the general sensory tracing

Appropriate receptoràAppropriate spinal nerve(s)à
Appropriate plexus(if needed)à
appropriate ramusàdorsal root ganglionà dorsal rootà
dorsal hornà white tractàbrain stemà
thalamus (synapse)à
internal capsuleà
sensory cortex of the cerebrum (parietal lobe)

Make up of the general motor tracing

Motor Cortex of the
Cerebrum (Frontal Lobe)à
Internal Capsuleà
Thalamus (synapse)à
brain stemà white tractàVentral hornàVentral
rootàAppropriate
ramusà Appropriate plexus(if needed)à Appropriate spinal nervesàEffector
(this will be given to you)

*There is a list on the following page that tells you where
all the nerves innervate you should be familiar with the general structures
that each spinal nerve you learn innervate.

1) You
are walking barefoot on hot sand. Trace the sensory message from receptors on
the plantar surface of the foot to the primary sensory cortex.

2) In
order to perform biceps curls, you must use the elbow flexors. Trace the motor
pathway from the brain to the appropriate muscles.

3) You
decided to treat yourself to a massage. Trace the sensory message from the
pressure receptors of the muscles of the back to the primary somatic sensory
cortex.

4) You
are walking up the stairs to anatomy class. Trace the motor pathway from your
brain to the appropriate hip flexors.
5) While hanging a picture on the wall, the hammer slips and you hit your
thumb. You experience a great deal of pain. Trace the sensory message of pain
from receptors to the primary sensory cortex.

Cervical Plexus C1-C4

Phrenic Nerve Diaphram: Motor impulse
only

Brachial Plexus C5-T1

Axillary Nerve skin and muscle of the
shoulder

Musculocutaneous Nerve elbow flexors
(ex: biceps) skin of lateral forearm

Median Nerve wrist flexors (lateral
side) skin of palm and wrist (lateral side)

Ulnar Nerve wrist flexors (medial side)
skin of medial surface of hand (ant/post)

Radial Nerve wrist and elbow extensors
(ex: triceps) skin of posterior lateral arm/forearm and hand

No plexus !

Thoracic Nerves (via ventral ramus)-
“intercostal nerves”

skin and muscles of the thoracic and
abdominal walls

Thoracic Nerves (via dorsal ramus) skin
and muscles of the back

Lumbar Plexus T12-L4

Obturator Nerve Adductor muscles of hip
Skin of inner thigh (proximal)

Femoral Nerve Hip flexors (ex:
quadriceps) skin over anterior region of thigh/leg

*Saphenous
Nerve skin of medial surface of leg and foot

Sacral Plexus L4-S4

Gluteal Nerve abductors and extensors
of the hip (ex: gluts, tensor faciae latae)

Sciatic Nerve hip extensors (ex:
semi-membranosus/semitendinosus)

*Tibial
Nerve knee and ankle flexors, foot plantarflexors (ex: gastrocnemius/tib.

posterior.)
skin on posterior surface of leg, plantar surface of foot.

*Fibular
Nerve ankle extensors skin on anterior surface of leg, dorsal surface of foot

·
A couple things of note

o the
only nerves that use the dorsal ramus are the dorsal thoracic nerves,
everything else uses the ventral plexus

o Nerves
written below each plexus attach to those plexus. Nerves indented with * attach to the nerves
above them that are not *’d, so both the tibial and fibular feed into the
sciatic

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