The arachnoid mater covering the brain is referred to as the arachnoidea encephali, and the portion covering the spinal cord as the arachnoidea spinalis.. The arachnoid and pia mater are sometimes considered as a single structure, the leptomeninx, or the plural version, leptomeninges. (Lepto- from the Greek root meaning thin). Similarly, the dura in this situation is called the pachymeninx.
Sweaty Hands Excessively sweaty hands are caused by the condition known as hyperhidrosis. Palmer (palm of the hand) hyperhidrosis is caused by a hyperactive sympathetic nervous system causing sweat glands in the hands to produce an excessive quantity of sweat.
Circulation issues can cause discoloration in your fingers. Normally, the bright red of oxygenated blood circulating under your skin creates a pink or reddish tint, especially around the finger tips. Pale skin indicates blood loss, while bluish or purple skin can stem from lack of oxygen in the blood. Purple or bluish-colored fingers can be caused by cyanosis, Raynaud's phenomenon and certain medical conditions. Discolored extremities may be cause for concern; contact your doctor if symptoms persist.