Depression is an anatomical term of motion describing movement in an inferior direction (moving away from the head towards the feet. It is the opposite of elevation.
Muscles
Shoulders Latissimus dorsi muscle Pectoralis minor muscle Trapezius muscle Serratus anterior muscle Subclavius muscle
Mouth hyoid / larynx Infrahyoid muscles sternothyroid sternohyoid thyrohyoid omohyoid mandible Lateral pterygoid muscle lower lip Depressor labii inferioris muscle angle of mouth Depressor anguli oris muscle nasal septum Depressor septi nasi muscle
Eyes eyeball Inferior rectus muscle Superior oblique muscle
Other eyebrow Depressor supercilii muscle diaphragm