(FAS). Mothers who consume alcohol anytime during pregnancy‚ puts their children at risk for multiple constellations of abnormalities when they are born. A common condition observed in children affected is optic nerve hypoplasia‚ which basically is the underdevelopment of the optic nerve during pregnancy. The affected child has abnormal shaped eyes that appear closer together‚ which can contribute to the poor visual acuity and their dysmorphic facial features shown up to ninety percent of the births
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Question: Identify the muscles in the anterior compartment of the leg The leg is divided into three compartments by tough fasciae to hold the muscles and proper functioning of these muscles during their contraction. These compartments also contain nerves and vessels. The three main compartments are anterior (extensor)‚ lateral (fibular) and posterior (flexor). The anterior compartment (Extensor compartment) contains muscles which are used for extension (dorsiflexion) of the foot as these muscles have
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is an area of skin that is mainly supplied by a single spinal nerve. There are eight cervical nerves (C1 being an exception with no dermatome)‚ twelve thoracic nerves‚ five lumbar nerves and five sacral nerves. Each of these nerves relays sensation (including pain) from a particular region of skin to the brain. Along the thorax and abdomen the dermatomes are like a stack of discs forming a human‚ each supplied by a different spinal nerve. Along the arms and the legs‚ the pattern is different: the
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The ulnar nerve is formed from the medial cord nerve roots of C7-T1. Originating in the brachial plexus‚ it descends down the arm before passing around the medial epicondyle of the elbow (the so-called funny bone) and then passes between the heads of flexor carpi ulnaris (FCU). It gives some cutaneous branches just before the wrist whilst the motor branches pass around the hook of hamate. Its motor contribution is to all small muscles of the hand except the lateral two lumbricals as well as FCU
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MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) In the spinal cord‚ white matter is organized into ascending and descending tracts grouping into A) nuclei. B) nerves. C) columns. D) ganglia. E) horns. 2) Enlargements of the spinal cord occur A) adjacent to the anterior median fissure. B) in the filum terminale. C) near the posterior median sulcus. D) in segments of the spinal cord that control the limbs. E) in the thoracic
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1) What structure(s) is (are) supplied by the meningeal branch of a spinal nerve? 2) What structure contains nuclei that control coughing‚ sneezing‚ swallowing‚ and vomiting? 3) What part of the nervous system is responsible for accelerating the heart rate in an emergency? 4) What is the terminal portion of the small intestine? 5) What structure connects the yolk sac to the embryonic midgut? 6) Nerves that pass through the sympathetic chain without synapsing innervate which structure
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your observations through the microscope of the neuron‚ the ox spinal cord smear‚ and the teased myelinated nerve. Answer these Questions: A. What is the functional difference between a neuron and a nerve? A neuron is a nerve cell and is a basic building block of the nervous system. Neurons also have special functions‚ like transmitting information throughout the body. A nerve is a bundle of neuron cells. B. What gives a multipolar neuron its name? A multipolar neuron contains several
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when the roots of the sciatic nerve are cut * As we cut the root of the right sciatic nerve of the frog in the experiment‚ the right lower leg of the frog becomes limp. The right gastrocnemius muscle lost its firmness and becomes flabby while I have observed as we compared the tonicity of the muscles with the left gastrocnemius muscle (with the root of left sciatic nerve is still intact) it is different. The left gastrocnemius muscle remains firm with the sciatic nerve connected. This observation
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external structure of the eyeball. The external layer of the eyeball is formed by the cornea‚ and the sclera. The cornea is a dome-shaped structure. The cornea does not have any blood vessels that is why it appears clear. The cornea does have nerves. The cornea is the first and most powerful lens in the eye’s optical system. The cornea is the first part of the eye to focus. When a ray of light hits the eye‚ the cornea is the first structure the light encounters. Then the light rays travel
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Introduction and Objective The action potential is an impulse of electrical activity. Action potential occurs when a neuron sends messages electrochemically down an axon called a nerve impulse. When a neuron is not stimulated or inactive‚ it is at resting potential. When a neuron is at rest‚ the electrical charge on the inside of the neuron is negative while the electrical charge on the outside of the neuron is positive. The resting membrane potential of a neuron is about -70 mV (mV = millivolts)
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