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https://www.kenhub.com/en/library/anatomy/lumbrical-muscles-of-the-hand
Jan 29, 2020 · Function and action. The lumbricals fulfill movements of the second to the fifth finger. Their contraction leads to flexion in the metacarpophalangeal joints (MCP) and extension in both the proximal (PIP) and distal interphalangeal joints (DIP). The reason for the opposite actions is that the tendons cross the MCP on the palmar side but distally insert at the dorsal side of the finger.
https://boneandspine.com/muscles-of-hand-and-wrist/
There are two groups of muscles of hand – extrinsic muscles and intrinsic muscles. Intrinsic muscles of the hand are those muscles which are located within the hand itself, in contrast to extrinsic muscles which originate proximally in the forearm and insert into the hand by long tendons.
https://www.pearsonhighered.com/assets/samplechapter/0/1/3/4/013439495X.pdf
380 UNIT 2 Support and Movement 11 flexor, but the slow muscle fibers of the underlying soleus (SO.-le.-us) are better suited for making continuous postural adjustments against the pull of gravity. These muscles are best seen in posterior and lateral views
https://www.sciencedirect.com/topics/neuroscience/plantar-flexors
Kenneth F. Swaiman, John Phillips, in Swaiman's Pediatric Neurology (Sixth Edition), 2017. Other Reflexes. A flexor (plantar) toe sign response is normal in children. The Babinski reflex is elicited by firm, steady, slow stroking from posterior to anterior of the lateral margin of the sole with an object such as a key or a tongue blade.
https://medical-dictionary.thefreedictionary.com/aponeurosis
aponeurosis [ap″o-noo͡-ro´sis] (pl. aponeuro´ses) a sheetlike tendinous expansion, mainly serving to connect a muscle with the parts it moves. adj., adj aponeurot´ic. Palmar aponeurosis. A fifth longitudinal band, radiating toward the base of the thumb, is sometimes present. From Dorland's, 2000. ap·o·neu·ro·sis, pl. ap·o·neu·ro·ses (ap'ō ...
https://en.wikipedia.org/wiki/Upper_limb
The shoulder girdle or pectoral girdle, 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 this muscle prevents dislocation in the joint, strong ...
https://www.kenhub.com/en/library/anatomy/upper-limb-muscles-and-movements
Jan 29, 2020 · The upper limb (upper extremity) is truly a complex part of human anatomy. It is best studied broken down into its components: regions, joints, muscles, nerves, and blood vessels. By looking at all of the upper limbs components separately we can appreciate and compartmentalize the information, then later view the upper limb as a whole and understand how all of its parts work in unison.
https://en.wikipedia.org/wiki/Brachial_plexus
The brachial plexus is a network of nerves (formed by the anterior rami of the lower four cervical nerves and first thoracic nerve (C5, C6, C7, C8, and T1).This plexus extends from the spinal cord, through the cervicoaxillary canal in the neck, over the first rib, and into the armpit.It supplies afferent and efferent nerve fibers to the chest, shoulder, arm, forearm, and hand.
https://www.versusarthritis.org/about-arthritis/treatments/surgery/hand-and-wrist-surgery/
The movement and power of your hand and wrist are controlled by muscles and tendons: The flexor group, on the inside or front of the arm, control bending of your fingers and wrist – these pass over the front of your wrist and are held in place by a strong fibrous band …
https://emedicine.medscape.com/article/1238395-technique
Oct 02, 2019 · The lumbricals contribute to metacarpophalangeal (MCP) joint flexion and IP joint extension. This proximal pulling of the profundus pulls the lumbrical tighter to extend the IP joints paradoxically with attempted flexion. [] However, lumbrical plus posture after amputations of the distal IP (DIP) joint is rare.
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