meaning of shaft in human body
[3], The femur develops from the limb buds as a result of interactions between the ectoderm and the underlying mesoderm, formation occurs roughly around the fourth week of development.[8]. Here the two trochanters, greater and lesser trochanter, are found. How long will the footprints on the moon last? Your urethra is inside the shaft. The lateral condyle is the more prominent and is the broader both in its antero-posterior and transverse diameters. The adductor crest is also often absent in mammals or alternatively reduced to a series of creases along the surface of the bone.[10]. When did organ music become associated with baseball? The abdomen (commonly called the belly) is the body space between the thorax (chest) and pelvis. The greater trochanter was present in the extinct archosaurs, as well as in modern birds and mammals, being associated with the loss of the primitive sprawling gait. The body (shaft) is prismoid in form, and curved, so as to be convex in the longitudinal direction behind, concave in front. Pelvis and patella are shown as semi-transparent. The greater trochanter is almost box-shaped and is the most lateral prominent of the femur. Hair shafts protect the skin in a variety of ways. On the surface of Mars, you would live and work in approximately one-third of Earth’s gravity, and when you return home you will have to readapt to the gravity we take for granted. When your penis gets hard, the foreskin pulls back and the tip is exposed. Human females have thicker pelvic bones, causing their femora to converge more than in males. [6] A structure of minor importance in humans, the incidence of the third trochanter varies from 17–72% between ethnic groups and it is frequently reported as more common in females than in males. [3], Anteriorly, the condyles are slightly prominent and are separated by a smooth shallow articular depression called the patellar surface. In cross-section, the thigh is divided up into three separate fascial compartments divided by fascia, each containing muscles. Position of femur (shown in red). Each consists of a free portion or shaft (scapus pili) and a … Collectively, the threadlike outgrowths that form the fur of animals or that grow on the human body. The shaft starts to ossify quite early, around the eighth week of fetal growth. In the condition genu valgum (knock knee) the femurs converge so much that the knees touch one another. These compartments are named the anterior, medial and posterior fascial compartments. In invertebrate zoology the name femur appears in arthropodology. Structures analogous to the third trochanter are present in mammals, including some primates.[7]. In the average life span of a human being, the large intestine processes approximately fifty tons of food. The hip region is located lateral and anterior to the gluteal region, inferior to the iliac crest, and overlying the greater trochanter of the femur, or "thigh bone". In harvesting the bone the middle third is always taken and the ends preserved (4 cm proximally and 6 cm distally) A hair is a thin, flexible shaft of cornified cells that develops from a cylindrical invagination of the epidermis, the hair follicle. What is the preposition in is the center considered the most important basketball player on the team? [3], The third trochanter is a bony projection occasionally present on the proximal femur near the superior border of the gluteal tuberosity. It helps transmit sensory information. The femur is the only bone in the upper leg. The neck of the femur is generally minimal or absent in the most primitive forms, reflecting a simple attachment to the acetabulum. The hindlimb development lags behind forelimb development by 1–2 days. The angle of convergence of the femora is a major factor in determining the femoral-tibial angle. It is a little broader above than in the center, broadest and somewhat flattened from before backward below. The tibia is a large bone located in the lower front portion of the leg. It looks like a tube. The body of the femur (or shaft) is long, slender and almost cylindrical in form. At its upper part is the adductor tubercle and behind it is a rough impression which gives origin to the medial head of the gastrocnemius. Due to the vast musculature of the thigh the shaft can not be palpated. long and the diameter is smallest front to back and compressed at its middle. [3], The transition area between the head and neck is quite rough due to attachment of muscles and the hip joint capsule. Its front part is named the patellar surface and articulates with the patella; it presents a median groove which extends downward to the intercondyloid fossa and two convexities, the lateral of which is broader, more prominent, and extends farther upward than the medial. Though an important organ of the human body, the removal of stomach does not pose threat to one’s life. In humans the neck of the femur connects the shaft and head at a … Foreskin The foreskin is a patch of skin that covers and protects the head (AKA glans). Put it in another way, a person consumes around 50 tons of food in the entire life. The size of the tubercle varies and it is not always located on the intertrochanteric crest and that also adjacent areas can be part of the quadrate tubercle, such as the posterior surface of the greater trochanter or the neck of the femur.