This is a lower brachial plexus injury, specifically affecting the C8 and T1 roots. It usually occurs when the arm is pulled violently upward (e.g., a difficult childbirth or grabbing a ledge while falling).
To understand T1, one must first visualize its starting point. It emerges from the spinal cord at the level of the T1 vertebra. t1 nerve
It provides sensation to the medial (inner) aspect of the forearm and the upper arm near the elbow. This is a lower brachial plexus injury, specifically
When T1 is compromised, the symptoms are unique and often dramatic. It emerges from the spinal cord at the
: It innervates several intrinsic hand muscles, including the abductor pollicis brevis (used for thumb movement), interossei (used to spread fingers), and lumbricals.
The motor fibers of T1 are vital for hand dexterity. They provide primary innervation to the . These are the muscles located within the hand itself (as opposed to the forearm).