In human anatomy
Human anatomy
Human anatomy is primarily the scientific study of the morphology of the human body. Anatomy is subdivided into gross anatomy and microscopic anatomy. Gross anatomy is the study of anatomical structures that can be seen by the naked eye...

, the groin areas are the two creases at the junction of the torso
Trunk or torso is an anatomical term for the central part of the many animal bodies from which extend the neck and limbs. The trunk includes the thorax and abdomen.-Major organs:...

 with the leg
Human leg
The human leg is the entire lower extremity or limb of the human body, including the foot, thigh and even the hip or gluteal region; however, the precise definition in human anatomy refers only to the section of the lower limb extending from the knee to the ankle.Legs are used for standing,...

s, on either side of the pubic area. This is also known as the medial (adductor) compartment of the thigh. A pulled groin muscle usually refers to a painful injury sustained by straining the hip adductor muscles
Adductor muscles of the hip
In human anatomy, the adductor muscles of the hip is a group of muscles of the thigh.-Muscles:The adductor group is made up of:*Adductor brevis*Adductor longus*Adductor magnus*Adductor minimus This is often considered to be a part of adductor magnus....

. These hip adductor muscles that make up the groin consist of the adductor brevis, adductor longus, adductor magnus, gracilis, and pectineus. These groin muscles adduct the thigh (bring the femur and knee closer to the body). The groin is innervated by the obturator nerve, except for the pectineus which is innervated by the femoral nerve and the hamstring part of the Adductor Magnus is innervated by sciatic nerve. This difference in innervation has caused some dispute whether or not the pectineus belongs to this groin and adduction group even though it still adducts the thigh.

The term is sometimes used as a euphemism
A euphemism is the substitution of a mild, inoffensive, relatively uncontroversial phrase for another more frank expression that might offend or otherwise suggest something unpleasant to the audience...

 for sex organ
Sex organ
A sex organ, or primary sexual characteristic, as narrowly defined, is any of the anatomical parts of the body which are involved in sexual reproduction and constitute the reproductive system in a complex organism; flowers are the reproductive organs of flowering plants, cones are the reproductive...

s since the names of the sex organs are taboo word
Profanity is a show of disrespect, or a desecration or debasement of someone or something. Profanity can take the form of words, expressions, gestures, or other social behaviors that are socially constructed or interpreted as insulting, rude, vulgar, obscene, desecrating, or other forms.The...

s in some cultures.

For vascular
Vascular in zoology and medicine means "related to blood vessels", which are part of the circulatory system. An organ or tissue that is vascularized is heavily endowed with blood vessels and thus richly supplied with blood....

 surgeons the groin is the preferred site for incisions to enter a catheter
In medicine, a catheter is a tube that can be inserted into a body cavity, duct, or vessel. Catheters thereby allow drainage, administration of fluids or gases, or access by surgical instruments. The process of inserting a catheter is catheterization...

 into the vascular system.

In the groin, underneath the skin are some lymph glands that play a role in the immune system
Immune system
An immune system is a system of biological structures and processes within an organism that protects against disease by identifying and killing pathogens and tumor cells. It detects a wide variety of agents, from viruses to parasitic worms, and needs to distinguish them from the organism's own...

. These can be swollen due to certain diseases. The most common cause being a simple infection and less likely cancer.
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