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Except for T1 antibiotics for uti birth control pills generic 750 mg keflex with amex, the ventral branches of the thoracic spinal nerves do not enter a plexus. Instead, they extend into spaces between the ribs as intercostal (inter-kostal) nerves (T2­T11) or under the ribs as subcostal nerves (T12). These nerves supply motor impulses to the intercostal muscles and the upper abdominal wall muscles. Suddenly bending the neck, called whiplash, can compress the nerves of the cervical plexuses, causing persistent headache and pain in the neck and skin, which the cervical nerves supply. If a broken or dislocated vertebra severs or damages the axons reaching the phrenic nerves from the cervical plexuses, partial or complete paralysis of the diaphragm may result. Intermittent or constant pain in the neck, shoulder, or upper limb may result from prolonged flexion of the arm, such as in painting or typing. It usually compresses spinal nerves between L2 and S1, which contain fibers of the sciatic nerve. In carpal tunnel syndrome, repeated hand movements, such as typing or weeding, inflame the tendons that pass through the carpal tunnel, which is a space between bones in the wrist. The swollen tendons compress the median nerve in the wrist, sending pain up the upper limb. Autonomic Nerve Fibers the motor pathways of the autonomic nervous system have a distinct pattern. The axon of such a second neuron is called a postganglionic (postgang-gle onik) fiber, and it extends to a visceral effector. This system controls visceral activities by regulating the actions of smooth muscles, cardiac muscles, and various glands. It oversees heart rate, blood pressure, breathing rate, body temperature, and other visceral activities that aid in maintaining homeostasis. Portions of the autonomic nervous system also respond during times of emotional stress and prepare the body to meet the demands of strenuous physical activity. Sympathetic Division In the sympathetic division (thoracolumbar division), the preganglionic fibers originate from neurons in the lateral horn of the spinal cord. These neurons are found in all of the thoracic segments and in the upper two lumbar segments of the cord (T1­L2). Their axons exit through the ventral roots of spinal nerves along with various somatic motor fibers. Preganglionic fibers extend a short distance, then leave the spinal nerves through branches called white rami (sing. Two groups of such ganglia, called sympathetic chain ganglia (paravertebral ganglia), form chains along the sides of the vertebral column. These ganglia, with the fibers that connect them, compose the sympathetic trunks (fig. The paravertebral ganglia lie just beneath the parietal pleura in the thorax and beneath the parietal peritoneum in the abdomen (see chapter 1, p. Although these ganglia are some distance from the viscera they help control, other sympathetic ganglia are nearer to the viscera.

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Venous drainage from the cochlear labyrinth is via the posterior and anterior spiral modiolar veins that form the common modiolar vein virus attacking children purchase keflex 750 mg with amex. The common modiolar vein and the vestibulocochlear vein form the vein of the cochlear aqueduct, which empties into the inferior petrosal sinus. Venous drainage from the vestibular labyrinth is via vestibular veins that join the vein of the cochlear aqueduct and by the vein of vestibular aqueduct, which drains into the sigmoid sinus. Tissues of the ear are derived from surface ectoderm (epithelia lining of the membranous labyrinth) and components of the first pharyngeal pouch (auditory tube and middle ear cavity), first pharyngeal groove (external acoustic meatus), first pharyngeal arch (malleus, incus, and anterior part of the auricle), and second pharyngeal arch (stapes and posterior part of the auricle). The internal ear has three fluid-filled spaces: the endolymphatic space within the membranous labyrinth (has a high K and a low Na concentration), the perilymphatic space between the wall of the bony and membranous laby rinth (has a low K and a high Na concentration), and the cortilymphatic space that lies within the tunnels of the organ of Corti of the cochlea. The bony labyrinth consists of three connected spaces: semicircular canals, vestibule, and cochlea, each containing different parts of the membranous labyrinth. The membranous labyrinth consists of a series of communicating sacs (utricle, saccule, and endolymphatic sac) and ducts (three semicircular ducts, cochlear duct, utriculosaccular duct, endolymphatic duct, and ductus reuniens) that contain endolymph. Specialized sensory cells are located in six regions in the membranous labyrinth: three cristae ampullaris in the ampullae of semicircular ducts (receptors for angular acceleration of the head), two maculae in the utricle and saccule (receptors for position of the head and its linear movements), and the spiral organ of Corti (receptors for sound). Utricle and saccule maculae contain hair cells that are epithelial mechanoreceptors. These hair cells contain hair bundles on their apical surfaces (formed by rows of stereocilia with a single kinocilium) and are overlaid with a gelatin-like otolithic membrane that contains otoliths (otoconia). Movement of the otoliths is detected by the hair bundles, which activate the mechanically gated ion channels to generate action potential. Movement of the cupula stimulates the mechanically gated ion channels to generate action potential. The cochlear canal is divided into three parallel compartments: scala media or cochlear duct (the middle compartment filled with endolymph that contains the spiral organ of Corti), scala vestibuli, and scala tympani (both containing perilymph). The scala media is a triangular space with its lower wall forming the basilar membrane on which the spiral organ of Corti resides. The upper wall (vestibular membrane) separates the scala media from scala vestibuli, and the lateral wall contains the stria vascularis that produces endolymph. The spiral organ of Corti is composed of hair cells (arranged in inner and outer rows), supportive phalangeal cells, and pillar cells. Movement of the stereocilia on hair cells during interaction with the overlying tectorial membrane generates electrical impulses that are transmitted to the cochlear nerve. Sound waves are transmitted from the vibrating tympanic membrane by the ossicles to the oval window, where they produce movement (waves) of the perilymph in the scala vestibule. This movement deflects the basilar membrane and spiral organ of Corti to generate electrical nerve impulses, which are perceived by the brain as sounds. Nerve impulses from the cristae ampullaris and maculae travel with the vestibular nerve, and the impulses from the spiral organ of Corti travel with the cochlear nerve.

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Muscles of the Abdominal wall the walls of the chest and pelvic regions are supported directly by bone antibiotic resistance veterinary buy keflex 250 mg line, but those of the abdomen are not. Instead, the anterior and lateral walls of the abdomen are composed of layers of broad, flattened muscles. A band of tough connective tissue, called the linea alba (line-ah albah), extends from the xiphoid process of the sternum to the pubic symphysis. Contraction of the abdominal muscles decreases the volume of the abdominal cavity and increases the pressure inside, which is transferred upwards to the thoracic cavity. This action helps move air out of the lungs during forceful exhalation and also aids in defecation, urination, vomiting, and childbirth. They include the following: External oblique Internal oblique Transversus abdominis Rectus abdominis more than thirty muscles provide fingertip dexterity and hand movements. Extensors the extensor carpi radialis longus (eks-tensor kar-pirade-alis longgus) runs along the lateral side of the forearm, connecting the humerus to the hand. The extensor carpi radialis brevis (eks-tensor kar-pi radealis brevis) is a companion of the extensor carpi radialis longus and is located medially to it. The extensor carpi ulnaris (eks-tensor kar-pi ul-naris) is located along the posterior surface of the ulna and connects the humerus to the hand. The extensor digitorum (eks-tensor diji-torum) runs medi ally along the back of the forearm. It connects the humerus to the posterior surface of the phalanges and extends the fingers (see figs. A structure called the extensor retinaculum consists of a group of heavy connective tissue fibers in the fascia of the wrist (see fig. It connects the lateral margin of the radius with the medial border of the styloid process of the ulna and certain bones of the wrist. The retinaculum gives off branches of connective tissue to the underlying wrist bones, creating a series of sheathlike compartments through which the tendons of the extensor muscles pass to the wrist and fingers. The external oblique (eks-ternal o-ble k), is a broad, thin ¯ sheet of muscle whose fibers slant downward from the lower ribs to the pelvic girdle and the linea alba. When this muscle contracts, it tenses the abdominal wall and compresses the contents of the abdominal cavity. Similar in structure and function is the internal oblique (in-ternal o-blek) which is a broad, thin sheet of muscle ¯ beneath the external oblique. The transversus abdominis (trans-versus ab-domi-nis) forms a third layer of muscle beneath the external and internal obliques. Its fibers run horizontally from the lower ribs, lumbar vertebrae, and ilium to the linea alba and pubic bones.

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Customer Reviews

Ayitos, 64 years: Actin molecules are globular, and each has a binding site to which the heads of a myosin molecule can attach (fig.

Wenzel, 23 years: In addition to the two layers of smooth muscle-an inner circular layer and an outer longitudinal layer-which are also in other regions of the alimentary canal, some parts of the stomach have an additional inner oblique layer, which strengthens the stomach wall and help the mixing and churning.

Joey, 33 years: Conduction of an impulse along an axon is similar to conduction of an impulse in a muscle fiber mentioned in chapter 9, page 304.

Kerth, 51 years: Enlargement of the optic nerve cup (central area of the optic disc) is also visible and a characteristic finding for glaucoma.