Jaw myology and bite force of the monk parakeet (Aves, Psittaciformes)

The Monk Parakeet in New York

Vocal tract articulation revisited: the case of the monk parakeet.

Birdsong and human speech share many features with respect to vocal learning and development. However, the vocal production mechanisms have long been considered to be distinct. The vocal organ of songbirds is more complex than the human larynx, leading to the hypothesis that vocal variation in birdsong originates mainly at the sound source, while in humans it is primarily due to vocal tract fil...

The Jaw Adductor Resultant and Estimated Bite Force in Primates

We reconstructed the jaw adductor resultant in 34 primate species using new data on muscle physiological cross-sectional area (PCSA) and data on skull landmarks. Based on predictions by Greaves, the resultant should (1) cross the jaw at 30% of its length, (2) lie directly posterior to the last molar, and (3) incline more anteriorly in primates that need not resist large anteriorly-directed forc...

Effect of bite force on the power spectrum of the surface electromyogram of human jaw muscles.

The frequency content of the surface electromyogram (EMG) of the anterior temporal and masseter muscles of 14 normal adults was obtained during maximum clench in intercuspal position, as well as at different bite force levels. Frequency analysis was carried out by computer using a fast Fourier transform algorithm to obtain the power-spectral density function and the power spectrum of the EMG si...

Jaw musculature of Cyclarhis gujanensis (Aves: Vireonidae).

Cyclarhis gujanensis is a little bird which feeds on high number of large preys, such frogs, lizards, snakes, bats and birds. As there are few studies on the cranial anatomy of this species, we aimed to describe the cranial myology to contribute to the anatomical knowledge of this species and to make some assumptions about functional anatomy. Thus, we described the muscles from the jaw apparatu...