Anatomy/Physiology Lab Practical 2 PNS

Peripheral Nervous System (PNS)

–Consists of nerve fibers that carry information between the CNS and other parts of the body

–Subdivided into Afferent and Efferent divisions

Afferent Division

Carries Information TO the CNS

Efferent Division

•Carries information away from CNS to effector organs

–Muscles and glands carry out orders to bring about desired effect

Cranial Nerve 1 (I)

Olfactory

Cranial Nerve 2 (II)

Optic

Cranial Nerve 3 (III)

Oculomotor

Cranial Nerve 4 (IV)

Trochlear

Cranial Nerve 5 (V)

Trigeminal

Cranial Nerve 6 (VI)

Abducens

Cranial Nerve 7 (VII)

Facial

Cranial Nerve 8 (VIII)

Vestibulocochlear

Cranial Nerve 9 (IX)

Glossopharyngeal

Cranial Nerve 10 (X)

Vagus

Cranial Nerve 11 (XI)

Accessory

Cranial Nerve 12 (XII)

Hypoglossal

Olfactory

CN near nose

Major Function = Smell

Optic

CN near eyes

Major Function - vision

Oculomotor

Eyeball and Eyelid Movement, Pupil Constriction, Change of lens shape for near vision

Proprioception (awareness of the position of body parts)

Trochlear

Eyeball Movement

Proprioception

Trigeminal

Chewing

Somatic Sensations (touch, pressure, pain, and temperature) of face and mouth

Abducens

Eyeball Movement

Proprioception

Facial

Facial expressions, secretion of saliva and tears

Taste from front of tongue

Vestibulocochlear

Hearing, sense of equilibrium

Glossopharyngeal

Swallowing, secretion of saliva

Taste from back of tongue, somatic sensation of oral cavity, blood-pressure monitoring

Vagus

Efferent output for skeletal muscles of pharynx (throat) and larynx (voice box) and for smooth muscle and glands of thoracic and abdominal organs and for cardiac muscle of heart

Afferent input for thoracic and abdominal organs, blood pressure monitoring

Accessory

Efferent output for skeletal muscles of pharynx, larynx, neck, and shoulder

Hypoglossal

Tongue Movement

Sensory

Olfactory CN is what type of fiber?

Sensory

Optic CN is what type of fiber?

Mixed (mainly motor)

Oculomotor CN is what type of fiber?

Mixed (mainly motor)

Trochlear CN is what type of fiber?

Mixed

Trigeminal CN is what type of fiber?

Mixed (mainly motor)

Abducens CN is what type of fiber?

Mixed

Facial CN is what type of fiber?

Sensory

Vestibulocochlear CN is what type of fiber?

Mixed

Glosspharyngeal CN is what type of fiber?

Mixed

Vagus CN is what type of fiber?

Motor

Accessory CN is what type of fiber?

Motor

Hypoglossal CN is what type of fiber?

Spinal Meninges

White Matter in Spinal Cord

Spinal Nerve

Dorsal Roots

Ventral Roots

Dorsal Root Ganglia

Central Canal

Posterior Median Sulcus

Anterior Median Fissure

Anterior Gray Matter Horns

Posterior Gray Matter Horns

Lateral Horns Gray Matter

Gray Commissure

Cervical Plexus

Which plexus is formed by C1-C4 SNs?

Cervical Plexus

Which plexus innervates the skin and muscles of the neck, shoulder, and arm?

Brachial Plexus

Which plexus is formed by C5-C8, T1 SNs?

Brachial Plexus

Which plexus supplies sensory and motor nerve fibers to the chest, shoulder, arm, forearm, and hand?

Brachial Plexus

Major Branches of which Plexus?

• Musculocutaneous Nerves

• Median Nerves

• Ulnar Nerves

• Axillary Nerves

• Radial Nerves

Thoracic nerves

Which Plexus/Nerves are formed by T1-T12 SNs?

Thoracic Nerves

Which plexus/nerves provide both somatic sensory and motor innervation to their corresponding intercostal spaces and some adjacent structures. Each intercostal nerve travels the entire length of its own numerically equivalent intercostal space. In other words, the nerves run their own course after emerging from the cord, innervating a narrow strip of skin in the anterior and posterior portion of the body in line with their emergence point from the spinal cord.

Lumbar Plexus

Which plexus is formed by L1-L4

Lumbar Plexus

Which plexus innervates the lower anterior abdominal wall, groin, thighs, knees, and calves?

Lumbar Plexus

Major branches of which plexus?

• Femoral Nerves

• Obturator Nerves

Sacral Plexus

Which plexus is formed by L4-S3 SNs?

Sacral Plexus

Which plexus innervates motor control to and receives sensory information from most of the pelvis and leg (upper, lower, foot)

Sacral Plexus

Major branches of which plexus?

• Sciatic Nerve

• Inferior Gluteal Nerves

• Superior Gluteal Nerves