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
