It comprises the vertebral column (spine) and two compartments of back muscles extrinsic and intrinsic. Level I is bound by the body of the mandible above, the stylohyoid muscle posteriorly, and the anterior belly of the contralateral digastric muscle anteriorly. The back is the body region between the neck and the gluteal regions. Arch Otolaryngol Head Neck Surg 2008 134: 536–8) The neck is conventionally divided into 6 levels Level VII is in the superior mediastinum (Figure 1).įigure 1: Classification of cervical nodal levels (Consensus statement on the classification and terminology of neck dissection. These vibrissae are connected to a substantial nerve network and transmit tactile information to the brain.Īll these parts working together make the manatee one well-adapted, marvelous mammal.\) The manatee does have some hair on its body, the most being around the snout. You can tell how old a manatee is by counting the annual growth rings in the ear bone. They don't have external earlobes, but anatomically, manatees appear to have good hearing. Their nostrils close automatically when going underwater. Their retinas contain both rod and cone cells, indicating that they can see both dim and bright light. The small eyes don't have eyelashes, but they do have a nictitating membrane for protection. Manatee lungs also help with buoyancy control. Humans change 10 percent when they breathe. With each breath, manatees change 90 percent of the air in their lungs. Instead of one diaphragm like many other mammals, manatees have two hemi-diaphragms. They can swim upside down, vertically, and can do somersaults and barrel rolls.Įach lung is in its own separate cavity. The powerful tail fluke propels the manatee through the water. The intestines can be up to 150 feet long. Their digestive tracts take up a large portion of their internal body cavities. Manatees eat anywhere from 10-15 percent of their body weight in food each day. They're used for steering, crawling, and for putting food into the mouth. Body: This is the major part of the pancreas that lies between its neck and tail. The neck runs from the top-right portion of the head of the pancreas to the left, to connect with the body of the organ. It lies posterior to the pyloric part of the stomach. The pectoral flippers are jointed and flexible, with three to four nails at the ends. Neck: This short section that lies between the head and the body is around 2.5 cm long. ![]() Infrahyoid muscles: Sternohyoid, sternothyroid, thyrohyoid, omohyoid. It is located in between the mandible and the clavicle, connecting the head directly to the torso, and contains numerous vital structures. Suprahyoid muscles: Digastric, mylohyoid, geniohyoid, stylohyoid. The neck is the bridge between the head and the rest of the body. Superficial muscles: Platysma, sternocleidomastoid. So if it wants to turn its head, the manatee has to move its entire body around. A large group of muscles in the cervical area, responsible for the movement of the head in all directions. They're the only aquatic mammals to have only six cervical vertebrae instead of seven. The molars behind them move into place, or, march. As the front molars wear down, they fall out. They have four sets of six to eight marching molars. Manatees are one of the only animals that keep replacing their teeth their entire lives. Behind the lips, horn-liked ridged pads break food down to smaller pieces. Each side of the lip can move independently of the other. ![]() And like the elephant, it has a large prehensile upper lip that it uses to pull food into its mouth. 3D interactive tutorials on the anatomy of the neck, including the anatomical organisation, musculature, larynx, pharynx, blood supply and innervation. human neck muscles structure figure digital front. The manatee may look like a cousin to the walrus, but its closest living relative is actually the elephant. 42,485 results for neck anatomy in images Vector illustration of Neck muscles anatomy Human anatomy. Innervation: vesical plexus and (in women) pudendal nerves. ![]() Blood supply: inferior vesical and middle rectal arteries (in men), internal pudendal and vaginal arteries (in women) internal iliac veins. Take the slow-swimming graceful manatee, for example. Definition: a duct of the urinary bladder which transports urine outside the body. Every aquatic animal is adapted to its own particular lifestyle and habitat.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |