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Anatomy Imaging

46.86MB. 0 audio & 378 images. Updated 2019-05-31.

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Anatomy Image deck

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Title Male Perineum OccludedImage Clinical Clinical: Contraction of the bulbospongiosus muscle helps to evacuate any remaining urine in the spongy urethra. Comment Comment: The muscles of the male perineum are skeletal in nature and are innervated by the pudendal nerve and its branches. Many of these muscles have attachments to the central tendon of the perineum (perineal body). The perineal body is a midline structure located just anterior to the anal canal and just behind the bulb of the penis. This illustration shows the subdivision of the diamond-shaped perineum into an anterior urogenital triangle and a posterior anal triangle. An imaginary horizontal line connecting the 2 ischial tuberosities divides the perineum into these 2 descriptive triangles. The ishiocavernosus and bulbospongiosus muscles cover the crus of the penis (corpus cavernosum) and the bulb of the penis (corpus spongiosum). These bodies are the erectile tissue of the penis. Origin Insertion Attachments Innervation Actions Plate Atlas Plate 375 1a Bulbospongiosus muscle with deep perineal fascia removed 2a Ischiocavernosus muscle with deep perineal fascia removed 3a Perineal membrane 4a Perineal body 5a Superficial transverse perineal muscle with deep perineal fascia removed 6a Parts of external anal sphincter muscle (Subcutaneous; Superficial; Deep) 7a Levator ani muscle (Pubococcygeus; Puborectalis; Iliococcygeus) 8a Gluteus maximus muscle 9a 10a 11a 12a 13a 14a 15a 16a 17a 18a 19a 20a Tags Block_III PelvisandPerineum

Title Muscles of Facial Expression 9 OccludedImage Clinical Comment Comment: This lateral view shows additional muscles of facial expression. The muscles around the eyes, ears, nose, and mouth blend with muscles of the lips, chin, and cheek. All are innervated by terminal branches of the facial nerve.As muscles of facial expression, these cutaneous muscles lie within the layers of the superficial fascia. They vary from person to person, and they often blend together.All of the muscles of facial expression are derived embryologically from the 2nd pharyngeal (branchial) arch and are innervated by the facial nerve (CN VII). Origin Insertion Attachments Innervation Actions Plate Atlas Plate 25 1a Auricularis superior 2a Auricularis anterior 3a Epicranial aponeurosis (galea aponeurotica) 4a Corrugator supercilii (frontalis and orbicularis oculi, partially cut away) 5a Procerus 6a Nasalis (Transverse part; Alar part) 7a Mentalis 8a Depressor labii inferioris 9a Risorius 10a 11a 12a 13a 14a 15a 16a 17a 18a 19a 20a Tags HeadandNeck

Title Extrinsic Eye Muscles 1 OccludedImage Clinical Clinical: Ptosis can result from nerve damage at two different sites. Damage to the occulomotor nerve (CN III) can result in paralysis of the levator palpebrae superioris muscle and significant ptosis. Damage anywhere along the sympathetic pathway from the upper thoracic sympathetic outflow to the head, the cervical sympathetic trunk, or the superior cervical ganglion and beyond can result in denervation of the small tarsal muscle (smooth muscle) that is found at the free distal margin of the levator palpebrae superioris muscle. This will result in a mild ptosis, where the ipsilateral upper eyelid droops, but only slightly. Comment Comment: Because of the dual nature of this muscle (it is skeletal and has a small smooth muscle component), drooping of the upper eyelid can result from a nerve lesion affecting the oculomotor nerve or the sympathetic fibers. This drooping is called ptosis. Origin Origin: Arises from the lesser wing of the sphenoid bone, anterior and superior to the optic canal. Insertion Insertion: Attaches to the skin and tarsal plate of the upper eyelid. Attachments Innervation Innervation: Oculomotor nerve (CN III). At the distal end of this muscle, near its attachment to the tarsal plate, is a small amount of smooth muscle called the superior tarsal muscle. The fibers of the superior tarsal muscle are supplied by postganglionic sympathetic fibers of the autonomic nervous system. Actions Action: Raises the upper eyelid. Plate Atlas Plate 84 1a Levator palpebrae superioris 2a 3a 4a 5a 6a 7a 8a 9a 10a 11a 12a 13a 14a 15a 16a 17a 18a 19a 20a Tags HeadandNeck Muscle

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