Everyday, multiple times a day I pet my two cats, Millicent
and Mortimer! I consider my cats my
babies and they love/demand attention! To pet my cats, I start by flexing my
knees and hips, squatting down to get on their level. I then reach out my arm
towards Morty and Millie (they are almost always together and most likely right under my feet), this
involves extending my arm and then flexing my shoulder. After my arm is
extended, I then pronate my arm so that my palm is facing down, to make contact
with the cats. Finally, I flex and extend my wrist to create the petting motion.
Flexion and Extension occur in the sagittal plane about the frontal axis of
rotation, while pronation occurs in the transverse plane about the vertical
axis. The osteokinematics of the elbow are flexion to extension in an open
kinematic chain. The prime movers for elbow extension are the Triceps Brachii
which shortens, performing a concentric contraction. The arthrokinematics of
elbow extension are the radial head and proximal ulna gliding along the distal
humerus posteriorly.
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