Middle Pharyngeal Constrictor (Chondropharyngeal Part)

Pharynx · Head & Neck

The Middle Pharyngeal Constrictor (Chondropharyngeal Part) is a Head & Neck muscle within the Pharynx group. Originating at Lesser horn of the hyoid bone and stylohyoid ligament, it inserts at Median pharyngeal raphe. Functionally, it constricts the pharynx to propel the bolus during swallowing. Innervation is provided by the Vagus nerve (CN X) via the pharyngeal plexus.

Origin, Insertion, Action & Nerve

Origin

Lesser horn of the hyoid bone and stylohyoid ligament

Insertion

Median pharyngeal raphe

Action

Constricts the pharynx to propel the bolus during swallowing

Nerve

Vagus nerve (CN X) via the pharyngeal plexus

Attachments explained

The Middle Pharyngeal Constrictor (Chondropharyngeal 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

Lesser horn of the hyoid bone and stylohyoid ligament

Insertion

Median pharyngeal raphe

Action & function

When the Middle Pharyngeal Constrictor (Chondropharyngeal 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 Middle Pharyngeal Constrictor (Chondropharyngeal 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 Middle Pharyngeal Constrictor (Chondropharyngeal 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 Middle Pharyngeal Constrictor (Chondropharyngeal Part) (the OIANS method)

OIANS stands for Origin, Insertion, Action and Nerve, the four facts that uniquely define every skeletal muscle. To learn the Middle Pharyngeal Constrictor (Chondropharyngeal 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 Middle Pharyngeal Constrictor (Chondropharyngeal 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.