Question

Name the major nerves that serve the following body areas.

1. biceps brachii
2. diaphragm
3. posterior thigh
4. fibularis muscles
5. flexor carpi radialis
6. deltoid
7. gracilis
8. anterior thigh
9. muscles of the perineum

Answer 1

qnerve plexus is a plexus (branching network) of intersecting nerves. A nerve plexus is composed of afferent and efferent fibers that arise from the merging of the anterior rami of spinal nerves and blood vessels. There are five spinal nerve plexuses, except in the thoracic region, as well as other forms of autonomic plexuses, many of which are a part of the enteric nervous system. The nerves that arise from the plexuses have both sensory and motor functions. These functions include muscle contraction, the maintenance of body coordination and control, and the reaction to sensations such as heat, cold, pain, and pressure. There are several plexuses in the body, including:

Spinal Plexuses

Cervical plexus - serves the head, neck and shoulders

Brachial plexus - serves the chest, shoulders, arms and hands

Lumbar plexus - serves the back, abdomen, groin, thighs, knees, and calves

Sacral plexus - serves the pelvis, buttocks, genitals, thighs, calves, and feet

Coccygeal plexus - serves a small region over the coccyx

Autonomic Plexuses

Celiac plexus (solar plexus) - serves internal organs

Auerbach's plexus (myenteric plexus) - serves the gastrointestinal tract

Meissner's plexus (submucosal plexus) - serves the gastrointestinal tract

Pharyngeal plexus of vagus nerve - serves the palate and pharynx

Cardiac plexus - serves the heart

Nerve plexus

Superimposed image of the spinal plexuses on a human back.

biceps, also biceps brachii (Latin for "two-headed muscle of the arm"), is a large muscle that lies on the front of the upper arm between the shoulder and the elbow. Both heads of the muscle arise on the scapula and join to form a single muscle belly which is attached to the upper forearm. While the biceps crosses both the shoulder and elbow joints, its main function is at the elbow where it flexes the forearm and supinates the forearm. Both these movements are used when opening a bottle with a corkscrew: first biceps unscrews the cork (supination), then it pulls the cork out (flexion

Answer 2

Answer:

Nerves are the bands of fibre that run a long the body connecting the Central nervous system ( brain)  and different organs of the body.

Nerves use both electrical impulses and chemical signals, running along them, to form a communication channel between the brain and various body organs.

Different body organs and body parts have different nerve supplies by which they send stimulus sensation ( chemical messages ) to the brain ( which is the sensory supply) and receive response ( which is the motor supply).

Explanation:

Here are a few body regions and organs and the nerves that supply them:

Biceps brachii

Nerve supply is musculocutaneous nerve

Diaphragm

The Nerve supply is Phrenic nerve - this provides the motor supply

The six intercostal nerves provide the sensory supply

Posterior thigh

The muscles of the posterior thigh are collectively known as the hamstrings.

The hamstrings, that is the posterior thigh, comprises of three muscles, namely; semitendinous, semimebranous and biceps femoris muscle

Biceps femoris innnervation:

a)  Long head of the biceps femoris is supplied by the Tibial division of sciatic nerve

b)  Short head of the biceps femoris is supplied by Common fibular division of sciatic nerve

Semitendinous muscles is supplied by tibial divison of the sciatic nerve

Semimembranous muscle is supplied by the tibial divison of the sciatic nerve

Fibularis muscle

Is supplied by the superficial fibular nerve

Flexor carpi radialis

Is supplied by the median nerve

Deltoid muscle

Deltoid muscle is supplied by the Axillary nerve

Gracilis muscle

Is supplied by the anterior branch of obturator nerve

Muscles of the anterior thigh

The anterior muscles of the thigh are supplied by the femoral nerve

These muscles include; quadriceps femoris (rectus femoris, vastus lateris, vastus medialis, vastus intermedius) and the satorius muscle.

Muscles of the perineum

The perineum is the surface region between the coccyx and the pubic symphisis.

The muscles of this region are supplied by the Perineal nerve, posterior scrotal nerves, dorsal nerve of the penis or clitoris.