The neuromuscular junction is the site of the signal exchange. The steps of this process in vertebrates occur as follows:(`) The action potential reaches the axon terminal. (2) Voltage-dependent calcium gates open, allowing calcium to enter the axon terminal.he neuromuscular junction is the site of the signal exchange. The steps of this process in vertebrates occur as follows:(`) The action potential reaches the axon terminal. (2) Voltage-dependent calcium gates open, allowing calcium to enter the axon terminal.
Sudden onset pain on the outer side of the foot can be from a fracture of the 5th Metatarsal and injuries to this bone are a common sports injury. Causes of pain on the outside of the foot are listed here: 1  Midtarsal Joint Sprain A mid tarsal joint sprain is an injury to the ligaments holding the mid tarsal joint together causing pain in the outside middle of the foot. 2  Peroneus Brevis Tendon Injury The Peroneus Brevis tendon inserts into the 5th matatarsal bone on the outside of the foot.
What are the causes and symptoms. Plantar fasciaâthe band of connective tissue on the bottom of your foot that stretches from the heel to the ball of your footâsupports your footâs arch. If this tissue becomes inflamed, youâll generally feel the pain in your heel. Eventually, hook-shaped calcium deposits, also known as bone or heel spurs, may form on your heel bone and cause further pain. Structural issues with the arch of your foot can lead to this cycle of inflammation, spur growth, and pain.