It Is the Esophagus
Eight pack
I'll give you a clue it starts with an "e." And has a "u" as the fifth letter.
The psoas muscle starts the the letters "ps."
Baclofen is a muscle relaxer that starts with the letter B
Anconeus
When the muscle starts to hurt.
KALVES
One muscle that starts with the letter "U" is the Ulnaris muscle, also known as the Extensor carpi ulnaris. It is located in the forearm and is responsible for wrist extension and adduction.
Sound it out. The 'e' in muscle is silent. Therefore it has not sound.
Muscle
jaw bone jaw muscle
A word that starts with E and ends with A: extravaganza.