Superior Pharyngeal Constrictor (Mylopharyngeal Part)

Pharynx · Head & Neck

Superior Pharyngeal Constrictor (Mylopharyngeal Part) belongs to the Pharynx group of the Head & Neck. Originating at Posterior end of the mylohyoid line of the mandible, it inserts at Median pharyngeal raphe and pharyngeal tubercle of the occipital bone. Its chief action is that it constricts the pharynx to propel the bolus during swallowing. Its nerve supply is the Vagus nerve (CN X) via the pharyngeal plexus.

Origin, Insertion, Action & Nerve

Origin

Posterior end of the mylohyoid line of the mandible

Insertion

Median pharyngeal raphe and pharyngeal tubercle of the occipital bone

Action

Constricts the pharynx to propel the bolus during swallowing

Nerve

Vagus nerve (CN X) via the pharyngeal plexus

Attachments explained

The Superior Pharyngeal Constrictor (Mylopharyngeal Part) is defined first by where it attaches. Its origin is the more fixed anchor, usually the proximal or more stable end that stays put during contraction, while its insertion is the more mobile point that is pulled toward the origin when the muscle shortens.

Origin

Posterior end of the mylohyoid line of the mandible

Insertion

Median pharyngeal raphe and pharyngeal tubercle of the occipital bone

Action & function

When the Superior Pharyngeal Constrictor (Mylopharyngeal Part) contracts, it produces the following movement: Constricts the pharynx to propel the bolus during swallowing.

As part of the Pharynx group of the Head & Neck, it works alongside neighbouring muscles to generate smooth, coordinated movement and to stabilise the structures it acts on.

Nerve supply & clinical relevance

The Superior Pharyngeal Constrictor (Mylopharyngeal Part) receives its nerve supply from the Vagus nerve (CN X) via the pharyngeal plexus.

Because a muscle can only contract when its nerve is intact, injury to the Vagus nerve can weaken or paralyse the Superior Pharyngeal Constrictor (Mylopharyngeal Part), impairing the movements it normally produces (constricts the pharynx to propel the bolus during swallowing). This is why knowing the innervation is central to localising nerve lesions in clinical practice.

How to study the Superior Pharyngeal Constrictor (Mylopharyngeal Part) (the OIANS method)

OIANS stands for Origin, Insertion, Action and Nerve, the four facts that uniquely define every skeletal muscle. To learn the Superior Pharyngeal Constrictor (Mylopharyngeal Part), work through them in order: picture its origin, trace the muscle to its insertion, reason out the action that shortening between those two points must create, then add the nerve that drives it.

Most students remember the Superior Pharyngeal Constrictor (Mylopharyngeal Part) fastest by linking its action back to its attachments rather than memorising each fact in isolation. Once the origin and insertion make sense, the action usually follows logically.