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The shoulder girdle is a complex of 5 joints that can be divided into two groups. 3 of these joints are true anatomical joints, while 2 are physiological ("false") joints. [explain 1] Within each group, the joints are mechanically linked so that both groups simultaneously contribute to the different movements of the shoulder to variable degrees.
Limbs are attached to the torso via girdles, either the pectoral girdle for the forelimbs, or the pelvic girdle for the hindlimbs.In terrestrial tetrapods, the pectoral girdles are more mobile, floating over the rib cage connected only via the clavicles (to the sternum) and numerous muscles; while the pelvic girdles are typically fused together anteriorly via a fibrocartilaginous joint and ...
They used paired pectoral and pelvic fins for locomotion. The pectoral fins developed into forelegs (arms in the case of humans) and the pelvic fins developed into hind legs. [78] Much of the genetic machinery that builds a walking limb in a tetrapod is already present in the swimming fin of a fish. [79] [80]
Learn the best chest exercises at home using bodyweight and dumbbells for an upper-body workout to target the pectoral muscles and armpit fat, improve posture.
The shoulder girdle [5] or pectoral girdle, [6] composed of the clavicle and the scapula, connects the upper limb to the axial skeleton through the sternoclavicular joint (the only joint in the upper limb that directly articulates with the trunk), a ball and socket joint supported by the subclavius muscle which acts as a dynamic ligament. While ...
When you first begin with the dumbbell exercises, start with 3-pound weights and work your way up to 5 or even 8 pounds. I recommend a medium-strength resistance with the resistance bands.
Unlike limb development in tetrapods, where the forelimb and hindlimb buds emerge at roughly the same timepoint, the pelvic fin bud emerges much later than the pectoral fin. [7] While the pectoral fin bud is apparent at 36 hours post fertilization (hpf) in zebrafish , the pelvic fin bud is only clear at around 21 days post fertilization (dpf ...
For an easy full-body workout, you can choose 4-5 exercises, aiming for a mix of upper- and lower-body moves, and perform 8 to 12 reps of each exercise before moving to the next (don't forget to ...