cricopharyngeus

The condition consists in a tonic contraction, ahead of the bolus, of the circular fibers of the inferior constrictor known as the cricopharyngeus muscle, or in a failure of this muscle to relax so as to allow the bolus to pass.

Bronchoscopy and Esophagoscopy A Manual of Peroral Endoscopy and Laryngeal Surgery Chevalier Jackson 1911

The firm and sometimes prominent ridge of the crossing of the left bronchus must not be mistaken for infiltration, and the esophagoscopist must be familiar with the normal rigidity of the cricopharyngeus.

Bronchoscopy and Esophagoscopy A Manual of Peroral Endoscopy and Laryngeal Surgery Chevalier Jackson 1911

-- At esophagoscopy there will be found marked exaggeration of the usual spasm which occurs at the cricopharyngeus during the introduction of the tube.

Bronchoscopy and Esophagoscopy A Manual of Peroral Endoscopy and Laryngeal Surgery Chevalier Jackson 1911

The larynx is attached only to the anterior wall, but is held closely against the posterior pharyngeal wall by the action of the inferior constrictor of the pharynx, and particularly by its specialized portion -- the cricopharyngeus muscle.

Bronchoscopy and Esophagoscopy A Manual of Peroral Endoscopy and Laryngeal Surgery Chevalier Jackson 1911

The fold of the cricopharyngeus can be repressed posteriorward by the forceps which are then in position to grasp the object when it is found.

Bronchoscopy and Esophagoscopy A Manual of Peroral Endoscopy and Laryngeal Surgery Chevalier Jackson 1911

The lower (posterior) half of the lumen is closed by the fold corresponding to the orbicular fibers of the cricopharyngeus which advances spasmodically from the posterior wall.

Bronchoscopy and Esophagoscopy A Manual of Peroral Endoscopy and Laryngeal Surgery Chevalier Jackson 1911

-- The upper illustration shows movements necessary for passing the cricopharyngeus.

Bronchoscopy and Esophagoscopy A Manual of Peroral Endoscopy and Laryngeal Surgery Chevalier Jackson 1911

The chute-like effect of the plica cricopharyngeus.

Bronchoscopy and Esophagoscopy A Manual of Peroral Endoscopy and Laryngeal Surgery Chevalier Jackson 1911

O, oblique fibers of the cricopharyngeus attached to the thyroid cartilage, T.

Bronchoscopy and Esophagoscopy A Manual of Peroral Endoscopy and Laryngeal Surgery Chevalier Jackson 1911

Moderate anterior or upward traction pulls the cricoid away from the posterior pharyngeal wall and the lumen of the esophagus opens above a crescentic fold (the cricopharyngeus).

Bronchoscopy and Esophagoscopy A Manual of Peroral Endoscopy and Laryngeal Surgery Chevalier Jackson 1911