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A squid's arm is used for grasping, capturing, and manipulating prey. It also helps in pushing food into the beak for consumption. Additionally, the suction cups on the arms provide a strong grip on objects and prey.
The humerous is the upper arm bone. Its primary function is to support the arm muscles and allow the arm to move.
The organ in the arm that is not necessary is the palmaris longus muscle. It is a thin muscle located on the palm side of the forearm and is absent in about 14% of the population. Its absence does not affect normal arm function.
The main function of the musculocutaneous nerve is to innervate the muscles in the anterior compartment of the arm, including the biceps brachii muscle. It also provides sensory innervation to the lateral aspect of the forearm.
The supraspinatus muscle is one of the four muscles of the rotator cuff in the shoulder. Its main function is to assist in the abduction (lifting away from the body) of the arm at the shoulder joint. It also helps to stabilize the shoulder joint during arm movements.
It acts as a strut to keep the scapula in place so the arm can hang freely.