Tissues are organized into four broad categories based on structural and functional similarities. These categories are epithelial, connective, muscle, and nervous. The primary tissue types work together to contribute to the overall health and maintenance of the human body. Thus, any disruption in the structure of a tissue can lead to injury or disease.

In a healthy person, the liver releases bile into the gallbladder, which the gallbladder stores and then releases to travel down the common bile duct into the small intestine to aid digestion. Rectus abdominis, external abdominal oblique, internal abdominal oblique, transversus abdominis, pyramidalis, quadratus lumborum Some teachers deprecate mechanistic measurements and strongly advise the artist to learn to estimate proportion by eye alone. [5] Areola. The areola is the pigmented area that surrounds the nipple. It is circular and varies in size from person to person. It contains small glands, called Montgomery glands, that secrete lubrication to keep the nipple from drying out, especially when nursing.Synovial membranes are a type of connective tissue membrane that supports mobility in joints. The membrane lines the joint cavity and contains fibroblasts that produce hyaluronan, which leads to the production of synovial fluid, a natural lubricant that enables the bones of a joint to move freely against one another.

Spinalis thoracis - originates from the spinous processes of T11-L2 and attaches onto the spinous processes of T2-T8. Injuries to the spine include fractures and dislocations of the vertebrae. These injuries can also damage the spinal cord.As a person ages, some bones fuse, a process which typically lasts until sometime within the third decade of life. Therefore, the number of bones in an individual may be evaluated differently throughout a lifetime. In addition, the bones of the skull and face are counted as separate bones, despite being fused naturally. Some reliable sesamoid bones such as the pisiform are counted, while others, such as the hallux sesamoids, are not. If a fertilized egg implants in the fallopian tube, doctors call this an ectopic pregnancy. An ectopic pregnancy is a medical emergency because the fallopian tube can rupture. Hymen