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Human penis. In human anatomy, the penis ( / ˈpiːnɪs /; pl.: penises or penes; from the Latin pēnis, initially "tail" [ 1]) is an external male sex organ ( intromittent organ) that serves as a passage for excretion of urine and ejaculation of semen. The main parts are the root, body, the epithelium of the penis including the shaft skin, and ...
The facial skeleton comprises the facial bones that may attach to build a portion of the skull. [1] The remainder of the skull is the neurocranium. In human anatomy and development, the facial skeleton is sometimes called the membranous viscerocranium, which comprises the mandible and dermatocranial elements that are not part of the braincase.
History of anatomy. Dissection of a cadaver, 15th-century painting. The history of anatomy extends from the earliest examinations of sacrificial victims to the sophisticated analyses of the body performed by modern anatomists and scientists. Written descriptions of human organs and parts can be traced back thousands of years to ancient Egyptian ...
Paleontology. The evolution of mammalian auditory ossicles was an evolutionary process that resulted in the formation of the bones of the mammalian middle ear. These bones, or ossicles, are a defining characteristic of all mammals. The event is well-documented [ 1] and important [ 2][ 3] as a demonstration of transitional forms and exaptation ...
FMA. 7488. Anatomical terms of bone. [ edit on Wikidata] The xiphoid process ( / ˈzɪfɔɪd / ), also referred to as the ensiform process, xiphisternum, or metasternum, constitutes a small cartilaginous process (extension) located in the inferior segment of the sternum, typically ossified in adult humans. [ 1] Both the Greek-derived term ...
The foramen lacerum ( Latin: lacerated piercing) is a triangular hole in the base of skull. It is located between 3 bones: sphenoid bone (forming the anterior border) [ 1]: 776. apex of petrous part of temporal bone (forming the posterolateral border) [ 1]: 776 [ 2] basilar part of occipital bone (forming the posteromedial border) [ 1]: 776.
Sex differences in human physiology are distinctions of physiological characteristics associated with either male or female humans. These differences are caused by the effects of the different sex chromosome complement in males and females, and differential exposure to gonadal sex hormones during development. Sexual dimorphism is a term for the ...
Contents. Cervical vertebrae. Position of human cervical vertebrae (shown in red). It consists of 7 bones, from top to bottom, C1, C2, C3, C4, C5, C6, and C7. In tetrapods, cervical vertebrae ( sg.: vertebra) are the vertebrae of the neck, immediately below the skull. Truncal vertebrae (divided into thoracic and lumbar vertebrae in mammals) lie ...