Lecture 4 – Anatomic Derivatives

Crus                                                                 L, leg                                       crus of penis

Crux                                                                L, cross                                    cruciate ligament – a pair of ligaments shaped like an X;  located in several joints of the body, such as the knee;  very strong ligaments that allow for a wide range of motion.  (Religious hint – crucify, crucifixion)

Peri                                                                  G, around                                perichondrium – a dense layer of cartilage (connective tissue) that goes around developing bone.  Literally cartilage (chondro-) that goes around (peri-)

Peroneus                                                          G, fibula                                  peroneus longus – a superficial muscle in the lateral aspect of the leg.  Peroneal nerve – a branch of the sciatic nerve which provides movement and sensation to the lower leg.

Post-                                                                L, after, behind                      postnatal (after birth)

Pre-                                                                  L, before                                  prenatal (before birth)

Ram-                                                                L, branch                                 ramus – dorsal ramus of spinal nerve – a branch of nerves.  Plural of ramus is rami.

Re-                                                                   L, again, back                          recurrent pain – happens again and again

Rect-                                                                L, straight                                 rectus femoris – (literally straight, of the femur) one of the four quadriceps muscles of the human body; located in the medial, anterior aspect of the thigh.  (Middle, front)

Ren                                                                  L, kidney                                 renal – having to do with kidneys (Also, Greek nephron, from ‘nephros’ meaning kidney)

Retro-                                                              L, back                                                retroperitoneal – the membrane that lines the abdominal cavity and most of the abdominal organs.  From the Greek peri- meaning around  + ‘tonos’ meaning a stretching = a stretching around.

Sect                                                                  L, to cut                                   dissect – to separate in order to inspect

Serra                                                                L, saw-like                               serratus anterior – a muscle that originates on the upper eight or nine ribs at the side of the chest; holds the scapula against the thoracic wall; also called the Boxer’s Muscle.  This muscle resembles the jagged edges of a saw.

Splenius                                                           G, bandage                              splenius capitis – Take a guess…bandage around the head?  A broad strap-like muscle in the back of the neck; Primarily responsible for moving the head.  So, if faced with this on a test and you do not remember studying this term, you would not place this muscle in the foot!  We have to think our way out of some situations.  Splenius means bandage and capitis has to do with the head.  Hopefully you recognize the importance of learning suffixes and prefixes.

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