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The triceps brachii is the principal structure which fills the space between the posterior border of the scapula and the humerus. The several heads originate for the most part on the border of the scapula, the deltoid tuberosity of the humerus and the shaft of the humerus. Insertion of this large muscular mass is effected by means of several tendons to the olecranon.
And therefore say some men, when they dread them of thieves in any way, or of enemies; JESUS AUTEM TRANSIENS PER MEDIUM ILLORUM IBAT; that is to say, 'Jesus, forsooth, passing by the midst of them, he went': in token and mind, that our Lord passed through, out the Jews' cruelty, and scaped safely from them, so surely may men pass the peril of thieves'. And then say men two verses of the Psalter three sithes: IRRUAT SUPER EOS FORMIDO & PAVOR, IN MAGNITUDINE BRACHII TUI, DOMINE. FIANT IMMOBILES, QUASI LAPIS, DONEC PERTRANSEAT POPULUS TUUS, DOMINE; DONEC PERTRANSEAT POPULUS TUUS ISTE, QUEM POSSEDISTI; and then may men pass without peril.
And than sey men 2 vers of the psautre, 3 sithes: Irruat super eos formido et pavor in magnitudine Brachii tui, Domine, Fiant inmobiles, quasi Lapis, donec pertranseat populus tuus, Domine; donec pertranseat populus tuus iste, quem possedisti. And thanne may men passe with outen perile.
Country practitioners, in restraining colts by casting with harness or ropes, occasionally observe a form of paresis wherein the radial nerve suffers sufficient injury that there is caused a temporary loss of function of the triceps brachii.
Great strain is put upon these parts because the biceps brachii is the chief inhibiting structure of the scapulohumeral articulation the one which prevents further flexion of the humerus during weight bearing. Passing, as it does, over two articulations, the biceps brachii has a somewhat complicated function, being a flexor of the radius and an extensor of the humerus.
Another of the same kind appears, 'Aug. 7, 1779, Partem brachii dextri carpo proximum et cutem pectoris circa mamillam dextram rasi, ut notum fieret quanto temporis pili renovarentur. And, 'Aug. 15, 1773. I cut from the vine 41 leaves, which weighed five oz. and a half, and eight scruples: I lay them upon my bookcase, to see what weight they will lose by drying. BOSWELL.
The author has observed and treated some twenty cases where an intensely painful infectious inflammation of the triceps brachii was caused by the intramuscular injection of a caustic solution by a cruel and unscrupulous empiric, whose object was to increase his practice. Symptomatology.
Thus it is seen, the biceps brachii is a weight bearing structure, as well as one that has to do with swinging the leg. Etiology and Occurrence. Blows and injuries received in runaway accidents do serious injury to the bursa and because of the peculiar and important part it plays during locomotion, serious injuries are not likely to resolve, and too often chronic lameness results.
Thus in his discussion of dislocation of the femur Roger says: Si crus a coxa sit disjunctum, eadem sit cura quam et in disjuncturam brachii et cubiti diximus, etc. The general subject of fistulae is treated at considerable length on folio 205b, and fistula lachrymalis and fistulae of the jaw receive special attention in their appropriate places.
The radial nerve supplies branches to the three heads of the triceps brachii, to the common and lateral extensors of the digit and also to the skin covering the forearm. Etiology and Occurrence. Nothing definite is known about the cause of some forms of radial paralysis.
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